#!/usr/bin/env python3

lines = (x.strip() for x in open("input.txt"))

cnt = [0] * 12

for line in lines:
    cnt = [x+(int(char)*2-1) for x, char in zip(cnt, line)]

gamma = int(''.join(['1' if x > 0 else '0' for x in cnt]), 2)
epsilon = int(''.join(['1' if x < 0 else '0' for x in cnt]), 2)

print(gamma * epsilon)