public static int func ( int n ) {
  int prime [ ] = new int [ n + 1 ] ;
  int pf [ ] = new int [ n + 1 ] ;
  Arrays . fill ( prime , 1 ) ;
  Arrays . fill ( pf , 0 ) ;
  int ct = 0 ;
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    if ( prime [ i ] == 1 ) {
      for ( int j = i + i ;
      j <= n ;
      j = j + i ) {
        prime [ j ] = 0 ;
        pf [ j ] += 1 ;
      }
    }
    if ( pf [ i ] == 2 ) ct ++ ;
  }
  return ct ;
}

public static int func ( int n ) { int prime [ ] = new int [ n + 1 ] ; int pf [ ] = new int [ n + 1 ] ; Arrays . fill ( prime , 1 ) ; Arrays . fill ( pf , 0 ) ; int ct = 0 ; for ( int i = 2 ; i <= n ; i ++ ) { if ( prime [ i ] == 1 ) { for ( int j = i + i ; j <= n ; j = j + i ) { prime [ j ] = 0 ; pf [ j ] += 1 ; } } if ( pf [ i ] == 2 ) ct ++ ; } return ct ; }
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