import java.util.*;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  }
} import java.util.*; util.* java import java.util.Collections; Collections java.util public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  } main {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) List<Integer> list = new ArrayList<Integer>(); list new ArrayList<Integer>() for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    } int i = 0; int i = 0; i 0 i <= 2 i 2 i++ i++ i {
      list.add(sc.nextInt());
    } {
      list.add(sc.nextInt());
    } list.add(sc.nextInt()) list.add list sc.nextInt() sc.nextInt sc int K = sc.nextInt(); K sc.nextInt() sc.nextInt sc Collections.sort(list, Collections.reverseOrder()) Collections.sort Collections list Collections.reverseOrder() Collections.reverseOrder Collections for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    } int i = 0; int i = 0; i 0 i < K i K i++ i++ i {
      list.set(0, list.get(0) * 2);
    } {
      list.set(0, list.get(0) * 2);
    } list.set(0, list.get(0) * 2) list.set list 0 list.get(0) * 2 list.get(0) list.get list 0 2 System.out.println(list.get(0) + list.get(1) + list.get(2)) System.out.println System.out System System.out list.get(0) + list.get(1) + list.get(2) list.get(0) + list.get(1) + list.get(2) list.get(0) list.get list 0 list.get(1) list.get list 1 list.get(2) list.get list 2 String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  }
} Main
import java.util.*;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i <= 2; i++) {
      list.add(sc.nextInt());
    }
    int K = sc.nextInt();
    Collections.sort(list, Collections.reverseOrder());
    for (int i = 0; i < K; i++) {
      list.set(0, list.get(0) * 2);
    }
    System.out.println(list.get(0) + list.get(1) + list.get(2));
  }
}
