#include <stdio.h>

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