#!/usr/bin/env python
#coding:utf8


def read():
    N = input()
    M = input()
    return N, M


def work((N, M)):
    N %= 10
    
    ans = 1
    while M:
        if M % 2 == 1:
           ans = ans * N % 10
        N = N * N % 10
        M /= 2
    
    print ans
    

if __name__ == "__main__":
    work(read())