int main()
{
	int n,s[1000],i,a,b,c,d;
	a=0;
	b=0;
	c=0;
	d=0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d",&s[i]);
		if(s[i]>=1&&s[i]<=18)
			a++;
		else if(s[i]>=19&&s[i]<=35)
			b++;
		else if(s[i]>35&&s[i]<=60)
			c++;
		else if(s[i]>60)
			d++;
	}
	printf("1-18: %.2lf%%\n",100*(double)a/n);
	printf("19-35: %.2lf%%\n",100*(double)b/n);
	printf("36-60: %.2lf%%\n",100*(double)c/n);
	printf("60??: %.2lf%%\n",100*(double)d/n);
	return 0;

}
