import java.math.*;
import java.util.*;
import java.util.function.*;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long H = sc.nextLong();
    sc.close();

    long cnt = 0;
    long h = H;
    while (h != 1) {
      h /= 2;
      cnt++;
    }
    long ans = 1;
    for (int i = 1; i <= cnt; i++) {
      ans += (long) Math.pow(2, i);
    }
    System.out.println(ans);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz