import java.util.Arrays;
import java.util.Scanner;

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[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    }
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner 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[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    }
} 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[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    } 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[] num = { a, b, c }; num { a, b, c } a b c Arrays.sort(num) Arrays.sort Arrays num int max = num[2]; max num[2] num 2 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 ans = num[0] + num[1] + max; ans num[0] + num[1] + max num[0] + num[1] + max num[0] num 0 num[1] num 1 max System.out.println(ans) System.out.println System.out System System.out ans 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[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    }
} 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[] num = { a, b, c };
        Arrays.sort(num);
        int max = num[2];
        for(int i = 0;i < k;i ++){
            max *= 2;
        }
        int ans = num[0] + num[1] + max;
        System.out.println(ans);
    }
} Main
import java.util.Arrays;
import java.util.Scanner;

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