static int findReachable ( int [ ] arr , int D , int A , int B , int n ) {
  int gcd_AB = GCD ( A , B ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( ( arr [ i ] - D ) % gcd_AB == 0 ) count ++ ;
  }
  return count ;
}

static int findReachable ( int [ ] arr , int D , int A , int B , int n ) { int gcd_AB = GCD ( A , B ) ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( ( arr [ i ] - D ) % gcd_AB == 0 ) count ++ ; } return count ; }
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