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