N = int(input())
M = int(input())

if M == 0:
  print(1)
  exit()

val = N%10
m = 0
arr = []
while val not in arr and m < M:
  arr.append(val)
  val *= N
  val %= 10
  m += 1

period = len(arr)
q, mod = divmod(M, period)
print(arr[mod-1])