#include<bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;

int n, ans;

bool f(int k) {
    int val = (int)(log2(k));
    
    return ((int)pow(2, val)) == k;
    
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    cin >> n;
    if (f(n)) {
        cout << (int)(log2(n)) << endl;
    } else {
        cout << (int)(log2(n)) + 1 + (int)pow(2,(int)(log2(n))+1) - n << endl;
    }
    

}