import java.util.Scanner;
import java.util.Arrays;
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 sum = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += max;
        System.out.println(sum);
    }
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays 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 sum = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += max;
        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 max = Math.max(A,Math.max(B,C));
        int sum = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += 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 = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += 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 = 0; sum 0 sum += A + B + C - max sum 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 sum += max sum 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){
        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 = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += max;
        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 max = Math.max(A,Math.max(B,C));
        int sum = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += max;
        System.out.println(sum);
    }
} Main
import java.util.Scanner;
import java.util.Arrays;
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 sum = 0;
        sum += A + B + C - max;
        for(int i = 0;i < K;i++){
            max *= 2;
        }
        sum += max;
        System.out.println(sum);
    }
}
