#include <stdio.h>


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