import java.util.*;
import java.io.*;
import java.lang.*;

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[] arr = {a,b,c};
        Arrays.sort(arr);

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

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

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

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

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

        for (int i = 0; i<k; i++){
            arr[2] = arr[2] * 2;
        }
        System.out.println(arr[0]+arr[1]+arr[2]);
    }
} Main
import java.util.*;
import java.io.*;
import java.lang.*;

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[] arr = {a,b,c};
        Arrays.sort(arr);

        for (int i = 0; i<k; i++){
            arr[2] = arr[2] * 2;
        }
        System.out.println(arr[0]+arr[1]+arr[2]);
    }
}