#include<bits/stdc++.h>
using namespace std;
int main(){  
    long long N; cin >> N;
    long long aa = N;
    long long temp = 0;
    while(true){
        if(N <= 0) break;
        temp += N;
        N /= 2;
    }
    long long maxV = 0, add = 0;
    for(long long i=aa; i > 0; i /= 2){
        maxV = max(maxV, i * 2 + add);
        add += N;
    }
    cout << abs(temp - maxV) << endl;
    return 0;
}