weight = int(input("Vnesi težo tovora: "))
fuel_weight = 0
actual_fuel_weight = 0

while weight > 0:
    weight = weight // 3 - 2
    fuel_weight += 1
    if weight <= 0:
        continue
    actual_fuel_weight += weight

print("Teža goriva:", fuel_weight)
print("Dejanska teža goriva:", actual_fuel_weight)