diff --git a/day01.py b/day01.py
new file mode 100644
index 0000000..b5405a6
--- /dev/null
+++ b/day01.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+
+def naive_fuel(mass : int) -> int:
+    return mass // 3 - 2
+
+def calc_fuel(mass : int) -> int:
+    fuel_mass = naive_fuel(mass)
+    if fuel_mass < 0:
+        return 0
+    return fuel_mass + calc_fuel(fuel_mass)
+
+def preproc(puzzle_input : str): 
+    return list(map(int, puzzle_input.split()))
+
+def partI(modules):
+    return sum(map(naive_fuel, modules))
+
+def partII(modules):
+    return sum(map(calc_fuel,  modules))
+
+import solver
+tests = solver.Tests()
+tests.add(1969, partI=654, partII=966)
+tests.add(100756, partI=33583, partII=50346)