
int main() {
	int i, n;
	double a = 0, b = 0, c = 0, d = 0;//??????
	char e = '%';
	cin >> n;
	int l[n];
	for (i = 0; i < n; i++) {//??????
		cin >> l[i];
		if (l[i] <= 18 && l[i] >= 1)
			a++;
		if (l[i] <= 35 && l[i] >= 19)
			b++;
		if (l[i] <= 60 && l[i] >= 36)
			c++;
		if (l[i] >= 61)
			d++;
	}
	a = 100 * a / n;
	b = 100 * b / n;
	c = 100 * c / n;
	d = 100 * d / n;
	printf("1-18: %.2f%c\n19-35: %.2f%c\n36-60: %.2f%c\n60??: %.2f%c", a, e, b, e,
			c, e, d, e);
	return 0;
}