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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  }
} 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  }
} 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  } 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  } 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 int total = a+b+c-max; total a+b+c-max a+b+c a+b+c a b c max 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 System.out.println(total + max) System.out.println System.out System System.out total + max total max 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  }
} 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  }
} 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));
    int total = a+b+c-max;
    for(int i = 0;i<k;i++){
      max*=2;
    }
    System.out.println(total + max);
  }
}
