#!/usr/bin/env lua

aim = 0
h = 0
v = 0

function down(val) aim = aim + val end
function up(val) aim = aim - val end
function forward(val) h = h + val; v = v + aim * val end

for line in io.lines("input.txt") do
    cmd, val = line:gmatch("(%S+) (%S+)")()
    _G[cmd](val)
end

print(("Answer: %d"):format(h * v))