N = int(input())
M = int(input())
if M == 0:
    print(1)
    exit()
a = N%10
n = [a]
for i in range(5):
    a *= (N%10)
    a %= 10
    n.append(a)
    if a==(N%10):
        break
print(n[(M%(i+1)-1)%(i+1)])