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