#!/usr/bin/env python

# forward, depth, aim
pos=[0,0,0]
with open("input01.txt", "r") as f:
    for line in f:
        tokens = line.split(" ", 2)
        tokens[1] = int(tokens[1])
        if tokens[0] == 'forward':
            pos[0] += tokens[1]
            pos[1] += (tokens[1]*pos[2])
        if tokens[0] == 'up':
            pos[2] -= tokens[1]
        if tokens[0] == 'down':
            pos[2] += tokens[1]

print(pos[0] * pos[1])