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