#include<bits/stdc++.h>
using namespace std;
int main()
{   
    int sum = 0,n;
    cin >> n;
    while(n != 1)
    {
        if(n % 2 == 0)
        {
            n = n / 2;
        }
        else
        {
            n = n* 3 + 1;
        }
        sum++;
   }
   cout << sum;
   return 0;
}

90分