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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    }
} 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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    }
} 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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    } 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 d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int max = a; max a if(max < b){
            max = b;
        } max < b max b {
            max = b;
        } max = b max b if(max < c){
            max = c;
        } max < c max c {
            max = c;
        } max = c max c int answer = a+b+c-max +max*(int)(Math.pow(2,d)); answer a+b+c-max +max*(int)(Math.pow(2,d)) a+b+c-max a+b+c a+b+c a b c max max*(int)(Math.pow(2,d)) max (int)(Math.pow(2,d)) Math.pow Math 2 d System.out.println(answer) System.out.println System.out System System.out answer 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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    }
} 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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    }
} 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 d = sc.nextInt();

        int max = a;
        if(max < b){
            max = b;
        }
        if(max < c){
            max = c;
        }
        int answer = a+b+c-max +max*(int)(Math.pow(2,d));
        System.out.println(answer);
    }
}