
import java.util.Scanner;

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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	}
} import java.util.Scanner; Scanner 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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	}
} 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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	} main {

		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int k = sc.nextInt();
		int result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	} 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 result = 0; result 0 int m = Math.max(a, b); m Math.max(a, b) Math.max Math a b int max =Math.max(m, c); max Math.max(m, c) Math.max Math m c int maxt = max; maxt 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 result = max + a + b + c - maxt result max + a + b + c - maxt max + a + b + c b max + a + b + c max a b c maxt System.out.println(result) System.out.println System.out System System.out result 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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	}
} 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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	}
} Main

import java.util.Scanner;

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 result = 0;
		
		int m = Math.max(a, b);
		int max =Math.max(m, c);
		int maxt = max;
				
		for(int i = 0; i < k; i ++) {
			max *= 2;
		}
		
		result = max + a + b + c - maxt;
		
		System.out.println(result);
	}
}
