diff --git a/2017/01/Cargo.lock b/2017/01/Cargo.lock
new file mode 100644
index 0000000..01238cd
--- /dev/null
+++ b/2017/01/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "day-01"
+version = "0.1.0"
+
diff --git a/2017/01/Cargo.toml b/2017/01/Cargo.toml
new file mode 100644
index 0000000..021d295
--- /dev/null
+++ b/2017/01/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day-01"
+version = "0.1.0"
+authors = ["logaritmisk <anders.e.olsson@gmail.com>"]
+
+[dependencies]
diff --git a/2017/01/input.txt b/2017/01/input.txt
new file mode 100644
index 0000000..2836582
--- /dev/null
+++ b/2017/01/input.txt
@@ -0,0 +1,2 @@
+3893445835429722678558456317563893861752455542588369533636585887178232467588827193173595918648538852463974393264428538856739259399322741844613957229674619566966921656443476317729968764183945899765294481327998956154956571467872487576314549468261122281384513266834769436913544431258253346374641589492728885222652146158261225296144835682556133922436438188211288458692217737145834468534829945993366314375465767468939773939978272968388546791547526366348163672162245585168892858977723516752284597322176349412485116173844733679871253985762643852151748396593275274582481295864991886985988427966155944392352248314629138972358467959614279553511247863869663526823326467571462371663396188951696286916979923587358992127741723727623235238531991996999181976664226274715591531566495345212849683589582225465555847312199122268773923175183128124556249916458878785361322713513153175157855597289482439449732469754748544437553251412476225415932478849961897299721228198262823515159848941742786272262236888514421279147329383465929358896761449135917829473321834267122759371247338155787774952626616791265889922959653887288735233291968146648533754958199821789499914763279869931218136266492627818972334549751282191883558361871277375851259751294611921756927694394977764633932938573132221389861617195291742156362494769521829599476753198422283287735888197584327719697758442462886311961723849326959213928195182293316227334998926839139915138472514686689887874559367524254175582135318545912361877139367538434683933333264146289842238921989275112323681356256979576948644489986951538689949884787173194457523474156229389465725473817651516136514446513436419126533875125645855223921197481833434658264655912731133356464193251635637423222227273192628825165993827511625956856754776849919858414375874943572889154281862749595896438581889424559988914658387293414662361364793844213298677236787998677166743945812899526292132465751582925131262933636228593134861363493849168168765261647652342891576445292462341171477487223253795935253493869317616741963486473
+
diff --git a/2017/01/src/main.rs b/2017/01/src/main.rs
new file mode 100644
index 0000000..b5416c8
--- /dev/null
+++ b/2017/01/src/main.rs
@@ -0,0 +1,62 @@
+use std::env;
+use std::fs;
+use std::io::Read;
+
+
+fn captcha(input: &str, step: usize) -> u32 {
+    let digits = input
+        .chars()
+        .flat_map(|c| c.to_digit(10))
+        .collect::<Vec<_>>();
+
+    let len = digits.len();
+
+    digits
+        .iter()
+        .enumerate()
+        .filter(|&(i, digit)| *digit == digits[(i + step) % len])
+        .map(|(_, digit)| digit)
+        .sum::<u32>()
+}
+
+fn main() {
+    let file_name = env::args().nth(1).expect("path to input file");
+
+    let mut input = String::new();
+
+    fs::File::open(file_name)
+        .and_then(|mut file| file.read_to_string(&mut input))
+        .expect("faild to read file");
+
+    for line in input
+        .lines()
+        .map(|line| line.trim())
+        .filter(|line| !line.is_empty())
+    {
+        println!("part-01: {}", captcha(line, 1));
+        println!("part-02: {}", captcha(line, line.len() / 2));
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part_1() {
+        assert_eq!(captcha("1122", 1), 3);
+        assert_eq!(captcha("1111", 1), 4);
+        assert_eq!(captcha("1234", 1), 0);
+        assert_eq!(captcha("91212129", 1), 9);
+    }
+
+    #[test]
+    fn part_2() {
+        assert_eq!(captcha("1212", 2), 6);
+        assert_eq!(captcha("1221", 2), 0);
+        assert_eq!(captcha("123425", 3), 4);
+        assert_eq!(captcha("123123", 3), 12);
+        assert_eq!(captcha("12131415", 4), 4);
+    }
+}