diff --git a/day_03/Cargo.toml b/day_03/Cargo.toml
new file mode 100644
index 0000000..dd71587
--- /dev/null
+++ b/day_03/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day_03"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/day_03/input.txt b/day_03/input.txt
new file mode 100644
index 0000000..cce464e
--- /dev/null
+++ b/day_03/input.txt
@@ -0,0 +1,6 @@
+,what(936,615)*:who()[[[~:mul(364,505)~;&{-*mul(431,254))  select(){}#*+]mul(617,948)$mul(117,664){) &why()<,why()mul(271,823)what(674,989);/~{'+[mul(311,405),-!mul(651,968)$?;[from()+  {mul(595,193)*}]what()^mul(250,791)!mul(114,297))]$from()from(573,794)how()why()how()mul(130,657)how()select(){what()mul(676,119)>{~@{%why(105,423)mul(307,665)&mul(757,115)/'*{};:mul(800,484),[:(,+why()~mul(679,186)]#where()'~where() do()+mul(699,53))/>}mul(332,602)@)}})mul(393,425)?(<how()]select(807,161)/mul(223,376){@)@what()>why(265,628)where()how()when()mul(598,633)]>? mul(200,581)@+[$who()mul(627,543):%(<^?mul(884,432)mul(896,310)mul(49,151)#^where()<!mul(777,855) where()+what()select()^<how()select()&mul(981,680)who()what()&from()<;,^mul(731,718)why(959,241)mul(80,831)>^>(+-@mul(732,887)from()where()%)?@);mul(176,994):from()*;&,/?mul(436,323) what()select()->/}-?:mul(312,150):<+mul(156,680)#;who()mul(768,550)>how()>what()#why()$don't()mul(713,94)@why(26,903):}where())+mul(173,537)mul(999,212)who(447,54)how(283,784)[{)where()/how() mul(966,107)select()-mul(246,450)'&mul(669,517)where(){mul(833,144)>/ ]]}( <don't() @-[ >~select()mul(890,267)mul(255,376):)'^@^*/do(){ , :{-mul(504,930):[when()^mul(558,410)}~+why():--#:(do()&]{where()#when()}#mul(407,999)%from(250,471)don't()>'@mul(750,449)what()mul(407,714)~from()how()mul(305,743),;who()-/[ }-mul(424,849)}]from()who()how(104,652)-<<:mul(423,458)@@)%~select()/mul(860,398)%(mul(943,958))$< /#+&[,mul(412,371)when(940,34)mul(482,638)when()(from(972,898)select()!mul(831,126)%don't()!mul(157,741)/;-}&+where()mul(307,860)<'(,why()mul(649,820);mul(275,560)}'+how()do()?,]why(49,835)#mul(936,375)where()mul(60,815)?&$+,,?who()mul(241,128)>]'?();-don't()*<mul(922,840)%]/>} ,who()mul(797,221)<]-$~mul(876,802)$what()%**mul(987,371)^ mul(918,15)'mul(323,693):why()@;who()([select()from()mul(408,140)#&'#who()why())^:}mul(850,606)^mul(661,471)who(),where(),when()[why();where()mul(439,437)*when(),:# mul??}from()-mul(151,663)$select(),~}when()select(303,600),select()mul(954,887),#mul(204,473)+~~:who():how()?what()when()mul(295,834)@{@!mul(321,586)>what()mul(848,598):~+from() mul(79,54)&*from()when()&]mul(856,657)@!!?}><?mul(96,604)%{from()*}why(623,40){@why()#mul(324,191):!^#} select()mul(418,472))*?/mul(824,756)what()mul(539,158)who()mul(713,145)'why()%$mul(990,164)why()!]mul(454,425);-,+//;:!)mul ?((where()why()*>mul(186,780)<?-from(357,516);+{{mul(998,102)^^]-<where(69,859)how()$+mul(103,590)&]from() where())how()*^do();&:where()when()~}when()#*mul(741,528)mul(163,283)select()[{}how()~+why()mul(980,471)select()mul(148,841)}]'how()~mul(742,591)-who()how()mul(40,958)why()>mul(280,999)how()+*don't()when()when()}}&how()$mul(161,922)mul(296,159)>'mul(664,400)* #mul(818>>;mul(589,575)^why()mul(598,449)-^+from()*mul(168,826)##where();mul(68,484)*[-}mul(767,665)%where()+mul(323,94)#~!who()what()mul(937,993) !%#+')$mul(920,949)?]: $!mul(606,26),what()*-how()where()do():+<-,mul(854,484)]$'(~select(229,111) '#when(793,632)mul(732,170)-mulwhy())who(759,347)%$,;who()when()%mul(957,812)~when():(select()> (&)mul(573,961)what()what()#!)(where()[mul(99,37):why()(mul(297,734!-+mul(333,746)#?where():mul(60,228)#{)!who()%mul(89,999)])(>?why();^mul(359,707)*;select()mul(116,922)when():%[/who()*mul(320,991)
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diff --git a/day_03/small_input.txt b/day_03/small_input.txt
new file mode 100644
index 0000000..2e1a90a
--- /dev/null
+++ b/day_03/small_input.txt
@@ -0,0 +1 @@
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
\ No newline at end of file
diff --git a/day_03/src/main.rs b/day_03/src/main.rs
new file mode 100644
index 0000000..6cd3261
--- /dev/null
+++ b/day_03/src/main.rs
@@ -0,0 +1,182 @@
+//https://adventofcode.com/2024/day/3
+//
+// Run command: cargo run ./input.txt
+
+use core::ops::Mul;
+use core::panic;
+use std::env;
+use std::error::Error;
+use std::fs::File;
+use std::io::{BufReader, prelude::*};
+use std::str::FromStr;
+#[derive(Eq, PartialEq, Clone, Debug)]
+enum Token {
+    Text(String),
+    Number(String),
+    Comma,
+    OpenParenthesis,
+    CloseParenthesis,
+    SpecialChar(char),
+    Whitespace,
+    NewLine,
+}
+
+// struct StringBuffer {
+//     string: String,
+//     seek_index: usize,
+// }
+
+// impl StringBuffer {
+//     pub fn new(string: String) -> StringBuffer{
+//         StringBuffer {
+//             string,
+//             seek_index: 0,
+//         }
+//     }
+
+//     pub fn take_char(&mut self) -> Option<char> {
+//         if self.seek_index < self.string.len() {
+//             self.seek_index += 1;
+//             return self.string.char_indices()[self.seek_index - 1];
+//         }
+//         return None;
+//     }
+// }
+
+fn is_mul_text_token(text_token: &str) -> bool {
+    if text_token.ends_with("mul") {
+        true
+    } else {
+        false
+    }
+}
+
+fn tokenize(input_str: String) -> Vec<Token> {
+    let mut tokens: Vec<Token> = Vec::new();
+    let mut chars = input_str.chars().peekable();
+    while let Some(c) = chars.next() {
+        let token = match c {
+            // Text Numeric
+            _ if char::is_alphabetic(c) => {
+                let mut text = c.to_string();
+                while let Some(alphabetic_char) = chars.next_if(|p| p.is_alphabetic()) {
+                    text.push(alphabetic_char)
+                }
+                Token::Text(text)
+            }
+            // Numbers
+            _ if char::is_numeric(c) => {
+                let mut number = c.to_string();
+                while let Some(numeric_char) = chars.next_if(|p| p.is_numeric()) {
+                    number.push(numeric_char)
+                }
+                Token::Number(number)
+            }
+            // whitespace
+            _ if char::is_whitespace(c) => {
+                while chars.next_if(|p| p.is_whitespace()).is_some() {}
+                Token::Whitespace
+            }
+            _ if c == ',' => Token::Comma,
+            _ if c == '(' => Token::OpenParenthesis,
+            _ if c == ')' => Token::CloseParenthesis,
+            _ if c == '\n' => Token::NewLine,
+            _ => Token::SpecialChar(c),
+        };
+        tokens.push(token);
+    }
+    tokens
+}
+
+#[derive(Debug)]
+struct MulOp {
+    lhs: String,
+    rhs: String,
+}
+
+impl MulOp {
+    pub fn multiple<T>(&self) -> Result<<T as Mul>::Output, <T as FromStr>::Err>
+    where
+        T: FromStr + Mul,
+    {
+        let lhs: T = self.lhs.parse()?;
+        let rhs: T = self.rhs.parse()?;
+        Ok(lhs * rhs)
+    }
+}
+
+fn parse_tokens(tokens: &Vec<Token>) -> Vec<MulOp> {
+    let mut tokens = tokens.iter().peekable();
+    let mut muls: Vec<MulOp> = Vec::new();
+    while let Some(token) = tokens.next() {
+        match token {
+            Token::Text(t) => {
+                if is_mul_text_token(t) {
+                    // Take OpenParenthesis or continue
+                    if !tokens.next_if_eq(&&Token::OpenParenthesis).is_some() {
+                        continue;
+                    }
+                    // Take Number or continue
+                    let lhs = if let Some(Token::Number(lhs)) =
+                        tokens.next_if(|v| matches!(v, Token::Number(_)))
+                    {
+                        lhs.to_owned()
+                    } else {
+                        continue;
+                    };
+                    // Take Comma or continue
+                    if !tokens.next_if_eq(&&Token::Comma).is_some() {
+                        continue;
+                    }
+                    // Take Number or continue
+                    let rhs = if let Some(Token::Number(rhs)) =
+                        tokens.next_if(|v: &&Token| matches!(v, Token::Number(_)))
+                    {
+                        rhs.to_owned()
+                    } else {
+                        continue;
+                    };
+                    // Take CloseParenthesis or continue
+                    if !tokens.next_if_eq(&&Token::CloseParenthesis).is_some() {
+                        continue;
+                    }
+                    muls.push(MulOp { lhs, rhs });
+                }
+            }
+            _ => (),
+        }
+    }
+    muls
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // Handle command input
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        panic!(
+            "{} must be run with a single argument of files name!",
+            &args[0]
+        )
+    }
+    let input_file_string = &args[1];
+
+    let input_buffer = BufReader::new(File::open(input_file_string)?);
+
+    let mut tokens: Vec<Token> = Vec::new();
+    for line in input_buffer.lines() {
+        tokens.append(&mut tokenize(line? + "\n"));
+    }
+    //println!("{:?}", tokens);
+
+    let muls = parse_tokens(&tokens);
+    //println!("{:?}", muls);
+
+    let mut accumulator: i64 = 0;
+    for mul in muls {
+        accumulator += mul.multiple::<i64>()?;
+    }
+
+    println!("Answer: {}", accumulator);
+
+    Ok(())
+}