static int countSol ( int coeff [ ] , int start , int end , int rhs ) {
  if ( rhs == 0 ) return 1 ;
  int result = 0 ;
  for ( int i = start ;
  i <= end ;
  i ++ ) if ( coeff [ i ] <= rhs ) result += countSol ( coeff , i , end , rhs - coeff [ i ] ) ;
  return result ;
}

static int countSol ( int coeff [ ] , int start , int end , int rhs ) { if ( rhs == 0 ) return 1 ; int result = 0 ; for ( int i = start ; i <= end ; i ++ ) if ( coeff [ i ] <= rhs ) result += countSol ( coeff , i , end , rhs - coeff [ i ] ) ; return result ; }
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