class Integer def combination(k) self.factorial/(k.factorial*(self-k).factorial) end def permutation(k) self.factorial/(self-k).factorial end def factorial return 1 if self == 0 (1..self).inject(:*) end end class Yukicoder MOD = 1000000000 def initialize n = gets.to_i m = gets.to_i puts m.combination((n-m*1000*(n/m/1000))/1000) % MOD end end Yukicoder.new