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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    }
} 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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    }
} 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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    } 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[] sum = {a,b,c}; sum {a,b,c} a b c for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        } int i =0; int i =0; i 0 i<k i k i++ i++ i {
            Arrays.sort(sum);
            sum[2] *=2;
        } {
            Arrays.sort(sum);
            sum[2] *=2;
        } Arrays.sort(sum) Arrays.sort Arrays sum sum[2] *=2 sum[2] sum 2 2 System.out.println(sum[0]+sum[1]+sum[2]) System.out.println System.out System System.out sum[0]+sum[1]+sum[2] sum[0]+sum[1]+sum[2] sum[0] sum 0 sum[1] sum 1 sum[2] sum 2 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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    }
} 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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    }
} 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[] sum = {a,b,c};

        for(int i =0;i<k;i++){
            Arrays.sort(sum);
            sum[2] *=2;
        }

        System.out.println(sum[0]+sum[1]+sum[2]);






      
    }
}
