diff --git a/src/day15.rs b/src/day15.rs
new file mode 100644
index 0000000..df7d580
--- /dev/null
+++ b/src/day15.rs
@@ -0,0 +1,70 @@
+use std::ascii;
+
+use crate::*;
+
+pub struct Day15;
+impl Day for Day15 {
+    const DAY_NUM: u8 = 15;
+    type Input = String;
+    type Output = usize;
+
+    fn get_test_data() -> Self::Input {
+        "rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7".into()
+    }
+    fn get_multiple_test_result() -> Box<impl Iterator<Item = Self::Output>> {
+        Box::new([52, 30, 253, 97, 47, 14, 180, 9, 197, 48, 214, 231].into_iter())
+    }
+    fn get_multiple_test_data() -> Box<impl Iterator<Item = Self::Input>> {
+        Box::new(
+            [
+                "HASH".into(),
+                "rn=1".into(),
+                "cm-".into(),
+                "qp=3".into(),
+                "cm=2".into(),
+                "qp-".into(),
+                "pc=4".into(),
+                "ot=9".into(),
+                "ab=5".into(),
+                "pc-".into(),
+                "pc=6".into(),
+                "ot=7".into(),
+            ]
+            .into_iter(),
+        )
+    }
+
+    fn get_test_result() -> Self::Output {
+        1320
+    }
+
+    fn run(data: Self::Input) -> Self::Output {
+        run_part1(&data)
+    }
+}
+fn run_part1(data: &str) -> usize {
+    assert!(!data.contains('\n'));
+
+    data.split(',')
+        .into_iter()
+        .filter_map(str::as_ascii)
+        .map(algorythm)
+        .sum()
+}
+fn algorythm(data: &[std::ascii::Char]) -> usize {
+    assert!(!data.contains(&ascii::Char::Comma));
+    let mut result = 0;
+
+    for x in data
+        .into_iter()
+        // .inspect(|x| print!("{x}:"))
+        .map(get_ascii_value)
+    {
+        result = ((result + x) * 17) % 256;
+        // println!("{result}");
+    }
+    result
+}
+fn get_ascii_value(c: &std::ascii::Char) -> usize {
+    c.to_u8() as usize
+}
diff --git a/src/lib.rs b/src/lib.rs
index beedca5..dc7455e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(test)]
 #![feature(iter_map_windows)]
+#![feature(ascii_char, ascii_char_variants)]
 
 pub fn read_input<T>(day: u8) -> T
 where
@@ -35,6 +36,9 @@ pub use day10::*;
 mod day14;
 pub use day14::*;
 
+mod day15;
+pub use day15::*;
+
 mod day19;
 pub use day19::*;
 
diff --git a/src/main.rs b/src/main.rs
index 05d9b6f..ed75df1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,8 @@ fn main() {
     // Day10::part1();
     // Day10::part2();
     // Day10::run_all();
-    Day14::run_all();
+    // Day14::run_all();   
+    Day15::part1();
     // Day14::part1();
     // Day14::part2();
     //Day19::run_all();