#include <iostream>
using namespace std;


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