static int countPrimePairs ( int n ) {
  int nNew = ( n - 2 ) / 2 ;
  boolean marked [ ] = new boolean [ nNew + 1 ] ;
  SieveOfSundaram ( marked , nNew ) ;
  int count = 0 , prime_num ;
  for ( int i = 1 ;
  i <= nNew ;
  i ++ ) {
    if ( marked [ i ] == false ) {
      prime_num = 2 * i + 1 ;
      count = count + ( prime_num / 2 ) ;
    }
  }
  return count ;
}

static int countPrimePairs ( int n ) { int nNew = ( n - 2 ) / 2 ; boolean marked [ ] = new boolean [ nNew + 1 ] ; SieveOfSundaram ( marked , nNew ) ; int count = 0 , prime_num ; for ( int i = 1 ; i <= nNew ; i ++ ) { if ( marked [ i ] == false ) { prime_num = 2 * i + 1 ; count = count + ( prime_num / 2 ) ; } } return count ; }
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