import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    }

    void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    }

    void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    }
} Main public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    } main {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    } try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        } {
            new Main().solve(sc);
        } Scanner sc = new Scanner(System.in) Scanner sc = new Scanner(System.in) new Scanner(System.in) new Main().solve(sc) new Main().solve new Main() sc String[] args args void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    } solve {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    } 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 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 int ans = a + b + c - max; ans a + b + c - max a + b + c a + b + c a b c max 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 System.out.println(ans +max) System.out.println System.out System System.out ans +max ans max Scanner sc sc public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    }

    void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    }
} public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    }

    void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            new Main().solve(sc);
        }
    }

    void solve(Scanner sc) {
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int k = sc.nextInt();
        int max = Math.max(a, Math.max(b, c));
        int ans = a + b + c - max;
        for (int i = 0; i < k; i++) {
            max *= 2;
        }
        System.out.println(ans +max);
    }
}