-- ﾅﾆｿﾚｲﾐﾜｶﾝﾅｲ

import Control.Monad

mo = 1000000000

nCr :: Integer -> Integer -> Integer
nCr n k
    | n < k = 1
    | otherwise = product [1..n] `div` product [1..k] `div` product [1..(n-k)]
        
main = do
  n <- readLn
  m <- readLn
  let
      n' = n `mod` (1000 * m) `div` 1000
   in print (nCr m n' `mod` mo)