import 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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}
} import java.util.*; util.* java 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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		} int i=0; int i=0; i 0 i < k i k i++ i++ i {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		} {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		} if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (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 >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			} (b >= a) && (b >= c) (b >= a) b a (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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}
} Main
import 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=0;i < k;i++) {
			if ((a >= b) && (a >= c)) {
				a = a*2;
			} else if ((b >= a) && (b >= c)) {
				b = b*2;
			} else {
				c = c*2;
			}
		}
		System.out.println(a+b+c);
	}
}