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

int main() {
    int n, ans = 2;
    cin >> n;
    while(n > 1){
        ans++;
        if(n % 2 == 0) n /= 2;
        else n = n * 3 + 1;
    }
    cout << ans << endl;
    return 0;
}