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

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