class Fixnum
  MOD = 10

  def power(x)
    result = 1 
    n = self

    while x > 0 
      result = (result * n) % MOD if (x & 1).nonzero?

      n = (n * n) % MOD
      x >>= 1
    end 

    result
  end
end

class Yukicoder
  def initialize
    n = gets.chomp.to_i
    m = gets.chomp.to_i

    puts n.power(m) % 10
  end
end

Yukicoder.new