H = {}
H[0] = [0]
H[1] = [1]
H[2] = [2, 4, 8, 6]
H[3] = [3, 9, 7, 1]
H[4] = [4, 6]
H[5] = [5]
H[6] = [6]
H[7] = [7, 9, 3, 1]
H[8] = [8, 4, 2, 6]
H[9] = [9, 1]

N = gets.to_i
M = gets.to_i

if M == 0 then
  puts 1
else
  a = H[N % 10]
  puts a[M % a.size - 1]
end