def main():
    #lines = [12, 14, 1969, 100756]
    with open("01ain.txt", "r") as file:
        lines = file.readlines()
    masses = [int(x) for x in lines]
    fuels = [getFuel(x) for x in masses]
    newfuels = []
    for fuel in fuels:
        of = fuel
        f = fuel
        while f > 0:
            f = getFuel(f)
            of += f
        newfuels.append(of)
    #print(newfuels)
    print(sum(newfuels))

def getFuel(f):
    fuel = (f//3) - 2
    if fuel > 0:
        return fuel
    return 0

if __name__ == "__main__":
    main()