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

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    }
} 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[] arr = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    }
} 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 = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    } 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 = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    } 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 = new int[]{a, b, c}; arr new int[]{a, b, c} Arrays.sort(arr) Arrays.sort Arrays arr for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        } int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
            arr[2] *= 2;
        } {
            arr[2] *= 2;
        } arr[2] *= 2 arr[2] arr 2 2 int sum = 0; sum 0 for (int i = 0; i < 3; i++) {
            sum += arr[i];
        } int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
            sum += arr[i];
        } {
            sum += arr[i];
        } sum += arr[i] sum arr[i] arr i System.out.println(sum) System.out.println System.out System System.out sum 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 = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    }
} 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 = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    }
} 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[] arr = new int[]{a, b, c};
        Arrays.sort(arr);

        for (int i = 0; i < k; i++) {
            arr[2] *= 2;
        }

        int sum = 0;
        for (int i = 0; i < 3; i++) {
            sum += arr[i];
        }

        System.out.println(sum);
    }
}
