MOD = 10**12

def main():
    n = int(input())

    i = 1
    ret = 1
    while ret>0 and i<=n:
        ret *= i
        ret %= MOD
        i += 1
    # print(i,ret)

    if ret == 0:
        return '000000000000'
    return ret

if __name__ == '__main__':
    print(main())