public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int A = Integer . parseInt ( sc . next ( ) ) ;
  int B = Integer . parseInt ( sc . next ( ) ) ;
  int C = Integer . parseInt ( sc . next ( ) ) ;
  int K = Integer . parseInt ( sc . next ( ) ) ;
  int [ ] hako = {
    A , B , C };
    Arrays . sort ( hako ) ;
    int max = hako [ 2 ] ;
    for ( int i = 0 ;
    i < K ;
    i ++ ) {
      max = max * 2 ;
    }
    max = max + hako [ 0 ] + hako [ 1 ] ;
    System . out . print ( max ) ;
  }
  
public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int A = Integer . parseInt ( sc . next ( ) ) ; int B = Integer . parseInt ( sc . next ( ) ) ; int C = Integer . parseInt ( sc . next ( ) ) ; int K = Integer . parseInt ( sc . next ( ) ) ; int [ ] hako = { A , B , C } ; Arrays . sort ( hako ) ; int max = hako [ 2 ] ; for ( int i = 0 ; i < K ; i ++ ) { max = max * 2 ; } max = max + hako [ 0 ] + hako [ 1 ] ; System . out . print ( max ) ; }
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