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