public static void main ( String [ ] args ) throws IOException {
  Scanner sc = new Scanner ( System . in ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int x [ ] = new int [ ] {
    sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) }, k = sc . nextInt ( ) ;
    Arrays . sort ( x ) ;
    long rem = k , ans = 1 ;
    for ( int i = 0 ;
    i < 3 ;
    ++ i ) {
      long kd = rem / ( 3 - i ) ;
      long s = Math . min ( x [ i ] , kd + 1 ) ;
      ans *= s ;
      rem -= s - 1 ;
    }
    out . println ( ans ) ;
    out . close ( ) ;
  }
  
public static void main ( String [ ] args ) throws IOException { Scanner sc = new Scanner ( System . in ) ; PrintWriter out = new PrintWriter ( System . out ) ; int x [ ] = new int [ ] { sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) } , k = sc . nextInt ( ) ; Arrays . sort ( x ) ; long rem = k , ans = 1 ; for ( int i = 0 ; i < 3 ; ++ i ) { long kd = rem / ( 3 - i ) ; long s = Math . min ( x [ i ] , kd + 1 ) ; ans *= s ; rem -= s - 1 ; } out . println ( ans ) ; out . close ( ) ; }
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