first def

Author: patrick.fischer

19/day01.py

@@ -7,4 +7,13 @@
 For a mass of 14, dividing by 3 and rounding down still yields 4, so the fuel required is also 2.
 For a mass of 1969, the fuel required is 654.
 For a mass of 100756, the fuel required is 33583.
-'''
+'''
+
+
+def fuel(mass: int) -> int:
+    return mass//3 - 2
+
+
+assert fuel(12) == 2
+assert fuel(14) == 2
+assert fuel(1969) == 654