static int countPair ( int a [ ] , int n ) {
  int maxm = a [ 0 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) if ( a [ i ] > maxm ) maxm = a [ i ] ;
  int [ ] prime = new int [ maxm + 1 ] ;
  for ( int i = 0 ;
  i < maxm + 1 ;
  i ++ ) prime [ i ] = 0 ;
  sieve ( maxm , prime ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = i + 1 ;
  j < n ;
  j ++ ) if ( prime [ a [ i ] ] == 0 || prime [ a [ j ] ] == 0 ) count ++ ;
  return count ;
}

static int countPair ( int a [ ] , int n ) { int maxm = a [ 0 ] ; for ( int i = 1 ; i < n ; i ++ ) if ( a [ i ] > maxm ) maxm = a [ i ] ; int [ ] prime = new int [ maxm + 1 ] ; for ( int i = 0 ; i < maxm + 1 ; i ++ ) prime [ i ] = 0 ; sieve ( maxm , prime ) ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = i + 1 ; j < n ; j ++ ) if ( prime [ a [ i ] ] == 0 || prime [ a [ j ] ] == 0 ) count ++ ; return count ; }
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