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


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, ans = 0;
    
    cin >> n;
    
    while (n > 1) {
        ans++;
        if (n % 2 == 1)
            n++;
        else
            n/=2;
    }
    cout << ans << endl;

}