x = 0 # horizontal position
d = 0 # depth

with open('data', 'r') as fp:
    for line in fp:
        data = line.split()

	if(data[0] == 'forward'):
            x = x + int(data[1])
        elif(data[0] == 'down'):
            d = d + int(data[1])
        else:
            d = d - int(data[1])

print "x: ", x
print "d: ", d
print " : ", x * d