#include <iostream>

using namespace std;

long long n, pos, now, ans;

int main()
{
    cin >> n;
    ans = n;
    for(int i = 0; i < 63; i++){
        while(!((1LL << now) & n) && now <= 61){
            now++;
        }
        if(now <= 61){
            ans ^= (1LL << now);
            ans |= (1LL << pos++);
        }
        now++;
    }
    cout << ans;
    return 0;
}