#include <bits/stdc++.h>
using namespace std;

using ull = unsigned long long;
using ll = long long;

int main()
{
    ull N;
    cin >> N;

    ull tmp = N;


    ull sum = 0;
    while(N != 0)
    {
        sum += N/2;
        N /= 2;
    }

    cout << tmp - sum << endl;
}