#include<iostream>
using namespace std;

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