#include <bits/stdc++.h>
using namespace std;
int main(){
	int x,s=0;
	cin>>x;
	int t=x;
	int N=0;
	do{
	    if(N%10==3){
	    	break;
		}else{
		    if(t%2==0){
		    	N+=t;
		    	t=t/2;
		    	s+=1;
			}else{
				N+=t;
				t=3*t+1;
				s+=1;
			}	
		}
	}while(true);
	cout<<s;
	return 0;
}