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

if M == 0:
    print(1)
else:
    ans = N % mod
    ans %= mod
    tmp = [ans]
    start = ans
    for i in range(M-1):
        ans *= N % mod
        ans %= mod
        if start == ans:
            break
        tmp.append(ans)
    print(tmp[M%len(tmp)-1])