# coding : utf-8

P, K = gets.split(' ').map{|s|s.to_i}

a = Array.new(K+1)
b = Array.new(K+1)

a[0] = 1
b[0] = 0

K.times do |i|
  a[i+1] = (P+1) * a[i] + 2 * b[i]
  b[i+1] = (P-1) * a[i] + 2 * (P-1) * b[i]
end

p a[K] % 1_000_000_007