#include<cstdio>
#include<string>
#include<iostream>
#include<algorithm>

using namespace std;

int main(void){
	int n;
	while(scanf("%d", &n) && n){
		int count = 0;
		
		while(n != 1){
			count++;
			if(n%2){
				n=n*3+1;
			}else {
				n/=2;
			}
		}
		printf("%d\n",count);
	}
	
	return 0;
}