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

x = 0
y = 0

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

print(x * y)