#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
using namespace std;

int main() {
    long long n,ans;
    cin >> n;
    ans = n;
    while(1){
        n /= 2;
        ans -= n;
        if(n == 0)break;
    }
    cout << ans << endl;
    return 0;
}