import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc int max = Math.max(a, Math.max(b, c)); max Math.max(a, Math.max(b, c)) Math.max Math a Math.max(b, c) Math.max Math b c for(int i = 0; i < k; i++){
      max *= 2;
    } int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
      max *= 2;
    } {
      max *= 2;
    } max *= 2 max 2 int sum = a + b + c + max - Math.max(a, Math.max(b, c)); sum a + b + c + max - Math.max(a, Math.max(b, c)) a + b + c + max c a + b + c + max a b c max Math.max(a, Math.max(b, c)) Math.max Math a Math.max(b, c) Math.max Math b c System.out.println(sum) System.out.println System.out System System.out sum String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  }
} Main
import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int k = sc.nextInt();
    int max = Math.max(a, Math.max(b, c));
    for(int i = 0; i < k; i++){
      max *= 2;
    }
    int sum = a + b + c + max - Math.max(a, Math.max(b, c));
    System.out.println(sum);
  }
}