
int main()
{
	int i, n, age;
	double a, b, c, d;
	a = b = c = d = 0;
	scanf("%d", &n);
	for(i=0; i<n; i++)
	{
		scanf("%d", &age);
		if(age <= 18)
			a ++;
		else if(age >= 19 && age <= 35)
			b ++;
		else if(age >= 36 && age <= 60)
			c ++;
		else
			d ++;
	}
	a /= (double)n;
	b /= (double)n;
	c /= (double)n;
	d /= (double)n;

	printf("1-18: %.2lf%%", a * 100.0);
	printf("\n19-35: %.2lf%%", b * 100.0);
	printf("\n36-60: %.2lf%%", c * 100.0);
	printf("\n60??: %.2lf%%", d * 100.0);

	return 0;
}