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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}

} 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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}

} 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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	} main {

		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int k = sc.nextInt();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	} 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 for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		} int i=1; int i=1; i 1 i<=k i k i++ i++ i {
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		} {
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		} if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			} a > b && a > c a > b a b a > c a c {
				a = a*2;
			} a = a*2 a a*2 a 2 if (b > c){
				b = b*2;
			} else {
				c = c*2;
			} b > c b c {
				b = b*2;
			} b = b*2 b b*2 b 2 {
				c = c*2;
			} c = c*2 c c*2 c 2 System.out.println(a+b+c) System.out.println System.out System System.out a+b+c a+b+c a b c 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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}

} 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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}

} 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();

		for (int i=1; i<=k; i++){
			if (a > b && a > c){
				a = a*2;
			} else if (b > c){
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}

}
