int main()
{
	int a,b,c,d;
	int i,n,t;
	a=b=c=d=0;
	scanf("%d",&n);
	for (i=1; i<=n; i++)
	{
		scanf("%d", &t);
		if (t<=18)
			a++;
		else
			if (t>=19&&t<=35)
			b++;
		    else 
				if(t>=36&&t<=60)
			    c++;
		        else
					if (t>=61)
			        d++;
	}
	double e,f,g,h;
	e=a*1.0/n*100;
	f=b*1.0/n*100;
	g=c*1.0/n*100;
	h=d*1.0/n*100;
	printf("1-18: %.2lf%\n", e);
	printf("19-35: %.2lf%\n", f);
	printf("36-60: %.2lf%\n", g);
	printf("60??: %.2lf%\n", h);
	return 0;
}
