Day 4 Part 1

day-01/input.txt

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+66521
+76924
+130449

day-01/main.nim

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+import math, strutils
+
+proc fuelCalc(mass: int): int = 
+    floor(mass / 3).toInt - 2
+
+
+proc calcForFuel(fuelMass: int): int =
+    let required = fuelCalc(fuelMass)
+    if required <= 0:
+        return 0
+    else:
+        return required + calcForFuel(required)
+
+proc calc(mass: int): int =
+    var massFuel = fuelCalc(mass)
+    var fuelFuel = calcForFuel(massFuel)
+    return massFuel + fuelFuel
+
+var result = 0;
+var file = open("input.txt", fmRead);
+for line in file.lines:
+    result += calc(line.parseInt)
+
+echo result