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

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[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 sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

	} main {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

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

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

	}
} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[3];
		for(int i=0;i<3;i++) {
			nums[i]= sc.nextInt();
		}
		int k=sc.nextInt();

		Arrays.sort(nums);
		for(int i=0; i<k;i++) {
			nums[2]*=2;
		}
		System.out.println(nums[0]+nums[1]+nums[2]);

	}
}