#include <iostream>
#include <iomanip>
#include <cstring>
#include <algorithm> 
#include <math.h>
#include <queue>
#include <functional>
#include <map>
#include <vector>
#include <string>
using namespace std;
typedef long long ll;
const ll MOD = 1000000007;
const int INF = 10000000;
int n;
int main(void){
    cin >> n;
    int ans = 0;
    ll t = 1;
    while (t < n){
        t *= 2;
        ans++;
    }
    ans += t - n;
    cout << ans << endl;
}