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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, ans = 0;
    cin >> n;
    while(n != 1){
        ans++;
        if(n % 2 == 0) n /= 2;
        else n = 3 * n + 1;
    }
    cout << ans << '\n';
}