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

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