n = int(input())
m = int(input())

n %= 10
X = [[0]*5 for i in range(10)]
for i in range(10):
    for j in range(5):
        X[i][j] = (i**j)%10
#print(X)
if m == 0:
    print(1)
else:
    print(X[n][(m-1)%4+1])