#include<cstdio>
using namespace std;
int main(void){
	int n,c;
	while(1){
		scanf("%d",&n);
		if(n==0)break;
		c=0;
		while(n!=1){
			if(n%2==0)n/=2;
			else      n=3*n+1;
			c++;
		}
		printf("%d\n",c);
	}
	return 0;
}