#include <cstdio>

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