int twice(int x)
{
	return 2 * x;
}

int main(void)
{
	int x;

	printf();
	printf();
	printf();
	if (scanf(, &x) != 1)
		return 0;

	switch (x % 2) {
	default:
		printf();
	case 0:
		printf();
		printf(, sqr(x));
		break;
	case 1:
		printf();
		goto sayhello;
	jumpin:
		printf(, x, twice(x));
		printf(); 
	sayhello:
		greet;
		if (x == -1)
			goto scram;   
		break;
	}

	printf();

	if (x != -1) {
		x = -1;   
	 	goto jumpin;  
	}

scram:
	printf();
	return 0;
}