n = int(raw_input()) % 10
m = int(raw_input()) % 10
l = [n]
while len(l) < 2 or l[0] != l[len(l)-1]:
    l.append((n * l[len(l)-1]) % 10)
s = len(l)-1
if m == 0:
    print 1
else:
    print l[(m % s)-1]