public static void main ( String [ ] args ) {
  Scanner reader = new Scanner ( System . in ) ;
  int [ ] arr = new int [ 3 ] ;
  arr [ 0 ] = reader . nextInt ( ) ;
  arr [ 1 ] = reader . nextInt ( ) ;
  arr [ 2 ] = reader . nextInt ( ) ;
  int K = reader . nextInt ( ) ;
  int ans = 0 ;
  Arrays . sort ( arr ) ;
  for ( int i = 0 ;
  i < K ;
  i ++ ) {
    arr [ 2 ] *= 2 ;
  }
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) {
    ans += arr [ i ] ;
  }
  System . out . print ( ans ) ;
  reader . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner reader = new Scanner ( System . in ) ; int [ ] arr = new int [ 3 ] ; arr [ 0 ] = reader . nextInt ( ) ; arr [ 1 ] = reader . nextInt ( ) ; arr [ 2 ] = reader . nextInt ( ) ; int K = reader . nextInt ( ) ; int ans = 0 ; Arrays . sort ( arr ) ; for ( int i = 0 ; i < K ; i ++ ) { arr [ 2 ] *= 2 ; } for ( int i = 0 ; i < 3 ; i ++ ) { ans += arr [ i ] ; } System . out . print ( ans ) ; reader . close ( ) ; }
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