static int binomialCoeff ( int x , int n , int k ) {
  int sum = 0 , term = 1 ;
  for ( int i = 1 ;
  i <= n && sum < k ;
  ++ i ) {
    term *= x - i + 1 ;
    term /= i ;
    sum += term ;
  }
  return sum ;
}

static int binomialCoeff ( int x , int n , int k ) { int sum = 0 , term = 1 ; for ( int i = 1 ; i <= n && sum < k ; ++ i ) { term *= x - i + 1 ; term /= i ; sum += term ; } return sum ; }
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