#include<stdio.h>
int main()
{
	int n = 0; 
	int count = 0; 
	scanf("%d", &n);
	while(n!=1)
	{
		if (n % 2 == 0)
		{
			n =n/ 2;
		}
		else
		{
			n=n*3+1;
		}  
		count++; 
	}
	
	printf("%d", count); 

	return 0;  
}