#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
using ll = long long;

int main(){
    int n;
    cin >> n;
    int ans = 0;
    while(n > 1){
        if(n % 2 == 0){
            n /= 2;
        }else{
            n += 1;
        }
        ans++;
    }
    cout << ans << endl;
    return 0;
}