import sys
from math import sqrt, pi, sin
inp = lambda : sys.stdin.readline()[:-1]
mii = lambda x = " ": [*map(int,input().split(x))]
mfi = lambda x = " ": [*map(float,input().split(x))]
ii = lambda : int(input())
def f(a, b):
if b == 0:
return 1
if b == 1:
return a % 10
d = f(a, b // 2)
return (d * d * a) % 10 if b % 2 else (d * d) % 10
a, b = mii()
print(f(a, b))