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();

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

		sc.close();
	}
} 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();

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

		sc.close();
	}
} 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();

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

		sc.close();
	} main {
		Scanner sc = new Scanner((System.in));
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int k = sc.nextInt();

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

		sc.close();
	} 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 if (a >= b && a >= c) {
			for (int i = 0; i < k; i++) {
				a *= 2;
			}
		} else if (b >= a && b >= c) {
			for (int i = 0; i < k; i++) {
				b *= 2;
			}
		} else {
			for (int i = 0; i < k; i++) {
				c *= 2;
			}
		} a >= b && a >= c a >= b a b a >= c a c {
			for (int i = 0; i < k; i++) {
				a *= 2;
			}
		} for (int i = 0; i < k; i++) {
				a *= 2;
			} int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
				a *= 2;
			} {
				a *= 2;
			} a *= 2 a 2 if (b >= a && b >= c) {
			for (int i = 0; i < k; i++) {
				b *= 2;
			}
		} else {
			for (int i = 0; i < k; i++) {
				c *= 2;
			}
		} b >= a && b >= c b >= a b a b >= c b c {
			for (int i = 0; i < k; i++) {
				b *= 2;
			}
		} for (int i = 0; i < k; i++) {
				b *= 2;
			} int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
				b *= 2;
			} {
				b *= 2;
			} b *= 2 b 2 {
			for (int i = 0; i < k; i++) {
				c *= 2;
			}
		} for (int i = 0; i < k; i++) {
				c *= 2;
			} int i = 0; int i = 0; i 0 i < k i k i++ i++ i {
				c *= 2;
			} {
				c *= 2;
			} 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 sc.close() sc.close sc 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();

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

		sc.close();
	}
} 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();

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

		sc.close();
	}
} 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();

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

		sc.close();
	}
}
