def pow(n, m):
    if m == 1: return n
    if m % 2 == 1:
        return (pow(n, m - 1) * n) % 10
    else:
        ret = pow(n, m // 2)
        return (ret ** 2) % 10


if __name__ == "__main__":
    n = int(input())
    m = int(input())

    print(pow(n, m))