#include<bits/stdc++.h>
using namespace std;

int Collatz(int n){
	if(n % 2 == 0){
		return n / 2;
	}else{
		return n * 3 + 1;
	}
}

int main(){
	int n;
	cin >> n;
	int ans = 1;
	Collatz(n);
	
	while(n != 1){
		Collatz(n);
		++ans;
	}
	
	cout << ans << "\n";
	return 0;
}