static long calc ( int n , long a ) {
  long MulSumN = 1 ;
  long MulSumA = 1 ;
  for ( int i = 1 ;
  i <= a ;
  i ++ ) {
    MulSumN *= n - i + 1 ;
    MulSumN %= MOD ;
    MulSumA *= i ;
    MulSumA %= MOD ;
  }
  return MulSumN * pow ( MulSumA , MOD - 2 ) % MOD ;
}

static long calc ( int n , long a ) { long MulSumN = 1 ; long MulSumA = 1 ; for ( int i = 1 ; i <= a ; i ++ ) { MulSumN *= n - i + 1 ; MulSumN %= MOD ; MulSumA *= i ; MulSumA %= MOD ; } return MulSumN * pow ( MulSumA , MOD - 2 ) % MOD ; }
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