import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	}
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	} main {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int[] a = new int[3]; a new int[3] 3 a[0] = scan.nextInt() a[0] a 0 scan.nextInt() scan.nextInt scan a[1] = scan.nextInt() a[1] a 1 scan.nextInt() scan.nextInt scan a[2] = scan.nextInt() a[2] a 2 scan.nextInt() scan.nextInt scan int k = scan.nextInt(); k scan.nextInt() scan.nextInt scan Arrays.sort(a) Arrays.sort Arrays a for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		} int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
			a[2] = 2 * a[2];
		} {
			a[2] = 2 * a[2];
		} a[2] = 2 * a[2] a[2] a 2 2 * a[2] 2 a[2] a 2 System.out.println(a[0] + a[1] + a[2]) System.out.println System.out System System.out a[0] + a[1] + a[2] a[0] + a[1] + a[2] a[0] a 0 a[1] a 1 a[2] a 2 String[] args args public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	}
} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[3];
		a[0] = scan.nextInt();
		a[1] = scan.nextInt();
		a[2] = scan.nextInt();
		int k = scan.nextInt();
		Arrays.sort(a);
		for(int i = 0; i < k; i++) {
			a[2] = 2 * a[2];
		}
		System.out.println(a[0] + a[1] + a[2]);
	}
}