diff --git a/2019/day1/src/main.rs b/2019/day1/src/main.rs
index 8785e06..a17f5d4 100644
--- a/2019/day1/src/main.rs
+++ b/2019/day1/src/main.rs
@@ -1,5 +1,5 @@
 fn main() {
-    let all_modules: [u32; 100] = [
+    let all_modules: [i32; 100] = [
         83568, 132382, 65095, 105082, 138042, 59055, 79113, 123950, 59773, 55031, 56499, 122835,
         123608, 82848, 109981, 115633, 126241, 137240, 54983, 129523, 101517, 90879, 82446, 105897,
         108653, 130530, 113607, 140338, 125646, 112605, 68080, 105466, 93462, 147116, 127370,
@@ -15,13 +15,25 @@ fn main() {
     for i in all_modules.iter() {
         result += fuel_calc(*i);
     }
-    println!("I need {} fuel for all modules", result);
+    println!("Part1: I need {} fuel for all modules", result);
+
+    //all_modules.map(fuel_calc).sum()
+    //all_modules.map(fuel_calc).sum()
+    println!("Part2: I need {} fuel for all modules", all_modules.iter().fold(0, |sum, x | fuel_calc_with_fuel(*x) + sum ));
 }
 
-fn fuel_calc(mass: u32) -> u32 {
+fn fuel_calc(mass: i32) -> i32 {
     mass / 3 - 2
 }
 
+fn fuel_calc_with_fuel(mass: i32) -> i32 {
+    let fuel = mass / 3 - 2;
+    if fuel <= 0 {
+        return 0;
+    }
+    fuel+fuel_calc_with_fuel(fuel)
+}
+
 #[test]
 fn test_it() {
     assert_eq!(fuel_calc(12), 2);