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

int main() {
    int N, ans = 0;
    cin >> N;
    while(N!=1) {
        if(N & 1) {
            N++;
            ans++;
        }
        N /= 2;
        ans++;
    }
    cout << ans << '\n';
    return 0;
}