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

	return 0;
}