diff --git a/Cargo.toml b/Cargo.toml
index faa6f42..bd73bad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,9 +10,9 @@ chrono = "0.4.23"
 regex = "1.7.0"
 
 [features]
-default = ["a", "b", "today"]
-a = []
-b = []
+default = ["part1", "part2", "today"]
+part1 = []
+part2 = []
 today = []
 01 = []
 02 = []
diff --git a/input/01.txt b/input/01.txt
index e69de29..9edd9dc 100644
--- a/input/01.txt
+++ b/input/01.txt
@@ -0,0 +1,2235 @@
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diff --git a/src/day01/mod.rs b/src/day01/mod.rs
index 05a6a9e..0542716 100644
--- a/src/day01/mod.rs
+++ b/src/day01/mod.rs
@@ -2,4 +2,29 @@ use crate::read;
 
 pub fn run() {
     let input = read("01");
+    let set = vec![0];
+
+    let mut res = input.lines().fold(set, |mut acc, x|{
+        if x.is_empty() {
+            acc.push(0);
+        } else {
+            let num: i32 = x.parse().unwrap();
+            *acc.last_mut().unwrap() += num;
+        }
+        acc
+    });
+    res.sort();
+    res.reverse();
+
+    #[cfg(feature="part2")]
+    {
+        let a = res.first().unwrap();
+        eprintln!("Part 01: {}", *a);
+    }
+
+    #[cfg(feature="part2")]
+    {
+        let b: i32 = res[..3].iter().sum();
+        eprintln!("Part 02: {}", b);
+    }
 }