#!/usr/bin/env python3

def main():
    content = open('input', 'r').readlines()
    input_length = len(content)
    # init with first row
    popcounts = [int(bit) for bit in content.pop(0).strip()]
    #print(popcounts)
    for line in content:
        popcounts = list(map(int.__add__, popcounts, [int(bit) for bit in line.strip()]))
    gamma_rate = ""
    for val in popcounts:
        if val >= (input_length/2):
            gamma_rate += "1"
        else:
            gamma_rate += "0"

    mask = (1 << len(popcounts)) - 1
    gamma_rate = int(gamma_rate, 2)
    epsilon_rate = gamma_rate ^ mask
    print(f'gamma: {bin(gamma_rate)}')
    print(f'epsil: {bin(epsilon_rate)}')

    print(gamma_rate * epsilon_rate)


if __name__ == "__main__":
    main()