PTA_乙级题_1001

#include <iostream>
using namespace std;
int main()
{
	long long int n,count;
	cin>>n;
	for(count = 0;;count++){
		if(n==1){
			break;
		}else if(n%2==0){
			n/=2;
		}else{
			n=(3*n+1)/2;
		}		
	}
	cout<<count<<endl;
}