
import java.util.Scanner;

public class Main {

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

} import java.util.Scanner; Scanner java.util public class Main {

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

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

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

} public class Main {

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

} Main

import java.util.Scanner;

public class Main {

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

}
