import java.util.*;

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

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