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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    }
} 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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    }
} 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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    } 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 hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    } 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 hoka = A + B + C - max; hoka 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(max+hoka) System.out.println System.out System System.out max+hoka max hoka 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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    }
} 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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    }
} 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 max = Math.max(A,Math.max(B,C));
    int hoka = A + B + C - max;    

    for(int i=0; i<K; i++){
        max *= 2;
    }
    System.out.println(max+hoka);
    }
}
