import java.util.Scanner;
import java.lang.Math;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        System.out.println(sum);
      
    }
} import java.util.Scanner; Scanner java.util import java.lang.Math; Math java.lang public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        System.out.println(sum);
      
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        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 max = Math.max(a, Math.max(b, c));      
        int sum = (int)Math.pow(2, k) * max + a + b + c - max;
        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 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 sum = (int)Math.pow(2, k) * max + a + b + c - max; sum (int)Math.pow(2, k) * max + a + b + c - max (int)Math.pow(2, k) * max + a + b + c b (int)Math.pow(2, k) * max + a + b + c (int)Math.pow(2, k) * max (int)Math.pow(2, k) Math.pow Math 2 k max a b c max 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) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        System.out.println(sum);
      
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        System.out.println(sum);
      
    }
} Main
import java.util.Scanner;
import java.lang.Math;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        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 sum = (int)Math.pow(2, k) * max + a + b + c - max;
        System.out.println(sum);
      
    }
}
