#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> P;

int main() {
    while (true) {
        int n;
        cin >> n;
        if (n == 0) break;

        int cnt = 0;
        while (n != 1) {
            if (n%2 == 0) n /= 2;
            else n = 3*n+1;
            cnt++;
        }

        cout << cnt << endl;
    }

    return 0;
}
