#include<iostream>
#include<string>
using namespace std;

int main(){
	int n, cnt=0; cin>>n;
	while(n != 1){
		cnt ++;
		if(n % 2 == 0){
			n/=2;
		}else {
			n = 3*n+1;
		}
	} 
	cout<<cnt;
	return 0;
}