#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    int n;
    cin >> n;
    
    int times = 0;
    while(n > 1) {
        if(n % 2 == 0) n /= 2;
        else n++;
        times++;
    }
    cout << times << "\n";
}