3n+1

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