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