diff --git a/2015/.gitignore b/2015/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
+++ b/2015/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/2015/Cargo.lock b/2015/Cargo.lock
new file mode 100644
index 0000000..6a45c5d
--- /dev/null
+++ b/2015/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aoc2015"
+version = "0.1.0"
diff --git a/2015/Cargo.toml b/2015/Cargo.toml
new file mode 100644
index 0000000..894e7fa
--- /dev/null
+++ b/2015/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "aoc2015"
+version = "0.1.0"
+authors = ["dece <shgck@pistache.land>"]
+edition = "2018"
+
+[lib]
+name = "aoc"
+
+[dependencies]
diff --git a/2015/src/bin/day1.rs b/2015/src/bin/day1.rs
new file mode 100644
index 0000000..35d770f
--- /dev/null
+++ b/2015/src/bin/day1.rs
@@ -0,0 +1,31 @@
+use aoc::input;
+
+fn main() {
+    let lines = input::read_lines();
+    let line = lines[0].to_owned();
+
+    // Part 1
+    let mut floor = 0;
+    for c in line.chars() {
+        match c {
+            '(' => floor += 1,
+            ')' => floor -= 1,
+            _ => {}
+        }
+    }
+    println!("Floor: {}", floor);
+
+    // Part 2
+    floor = 0;
+    for (i, c) in line.chars().enumerate() {
+        match c {
+            '(' => floor += 1,
+            ')' => floor -= 1,
+            _ => {}
+        }
+        if floor == -1 {
+            println!("Entered -1 at {}.", i + 1);
+            return
+        }
+    }
+}
diff --git a/2015/src/input.rs b/2015/src/input.rs
new file mode 100644
index 0000000..e0e02d1
--- /dev/null
+++ b/2015/src/input.rs
@@ -0,0 +1,17 @@
+use std::io;
+
+pub fn read_lines() -> Vec<String> {
+    let mut lines = vec!();
+    loop {
+        let mut text = String::new();
+        let read_count = io::stdin().read_line(&mut text).unwrap();
+        if read_count == 0 {
+            break
+        }
+        if let Some(stripped) = text.strip_suffix("\n") {
+            text = stripped.to_string()
+        }
+        lines.push(text);
+    }
+    lines
+}
diff --git a/2015/src/lib.rs b/2015/src/lib.rs
new file mode 100644
index 0000000..7839bc5
--- /dev/null
+++ b/2015/src/lib.rs
@@ -0,0 +1 @@
+pub mod input;