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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    }
} 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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    }
} 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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    } main {
    	Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int k = sc.nextInt();
      int i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    } 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 i = 1; i 1 while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      } i <= k i k {
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      } 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 if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c; a==max a max a = 2*a a 2*a 2 a if(b==max)b = 2*b;
        else if(c==max)c = 2*c; b==max b max b = 2*b b 2*b 2 b if(c==max)c = 2*c; c==max c max c = 2*c c 2*c 2 c i++ i System.out.println(a+b+c) System.out.println System.out System System.out a+b+c a+b+c a b c 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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    }
} 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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    }
} 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 i = 1;
      while(i <= k){
        int max = Math.max(a,Math.max(b,c));
      	if(a==max)a = 2*a;
        else if(b==max)b = 2*b;
        else if(c==max)c = 2*c;
        i++;
      }
      System.out.println(a+b+c);
    }
}