filename = "inputs/day2.input"
file = open(filename, "rb").readlines()
inputs = file

horiz = 0
depth = 0
aim = 0

for i in range(len(inputs)):
    command = inputs[i].decode("utf-8").split()
    if command[0] == "forward":
        horiz += int(command[1])
        depth += aim * int(command[1])
    if command[0] == "up":
        aim -= int(command[1])
    if command[0] == "down":
        aim += int(command[1])

print(horiz * depth)