#!/usr/bin/env python
# -*- coding: utf-8 -*-

N = int(input())%10
M = int(input())

if M == 0:
    print(1)
    quit()

ans_array = []
hoge = N
while hoge not in ans_array:
    ans_array.append(hoge)
    hoge = hoge * N % 10
print(ans_array[(M-1)%len(ans_array)])