#include<bits/stdc++.h> using namespace std; long long s,n; int main(){ cin>>n; while(1){ if(n1) break; else if(n%21) n=n*3+1; else n=n/2; s++; } cout<<s; return 0; }

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