import sys

sys.set_int_max_str_digits(11111)


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n = int(input()) % 10
    m = int(input())
    if m >= 4:
        m = 4 + m % 4
    return pow(n, m, 10)


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)