//https://pintia.cn/problem-sets/994805260223102976/problems

PTA乙级1001

#include <iostream>
using namespace std;
int main() {
    int n, count = 0;
    cin >> n;
    while (n != 1) {
        if (n % 2 != 0) 
        {n = 3 * n + 1;n=n/2;count++;}

        else
            {n = n / 2;count++;}
    }
    cout << count;
    return 0;
}