#include<iostream>

using namespace std;


int main(){
	int n,i,j,k;

	while (1){
		j = 0;
		cin >> n;
		if (n == 0){
			break;
		}

		while (n != 1){
			j++;
			if (n % 2 == 0){
				n = n / 2;
			}else{
				n = n * 3 + 1;
			}
		}
		cout << j << endl;
	}

}