import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long h = sc.nextLong();
        if (h < 2) {
            System.out.println(h);
            return ;
        }
        // how 2:pow
        int p = 0;
        while (true) {
            double p1 = Math.pow(2, p);
            double p2 = Math.pow(2, p+1);
            if (p1 <= h && h < p2) {
                break;
            }
            p++;
        }

        long[] memo = new long[p+1];
        memo[1] = 3;
        for (int i=2;i<=p;i++) {
            memo[i] = (memo[i - 1] - 1) * 2 + 3;
        }

        System.out.println(memo[p]);

    }
}

/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