static int countPrimes ( int n ) {
  SieveOfEratosthenes ( ) ;
  int cnt = 0 ;
  for ( int i = 2 ;
  i < n ;
  i ++ ) {
    if ( prime [ i ] && prime [ i - 2 ] ) cnt ++ ;
  }
  return cnt ;
}

static int countPrimes ( int n ) { SieveOfEratosthenes ( ) ; int cnt = 0 ; for ( int i = 2 ; i < n ; i ++ ) { if ( prime [ i ] && prime [ i - 2 ] ) cnt ++ ; } return cnt ; }
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