void main()
{
	int n,i,a[100],z=0,u=0,m=0,o=0,p=0;
	double h,j,k,l;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d",&a[i]);
		if(a[i]<19)
			u++;
		else if(a[i]<36)
			m++;
		else if(a[i]<61)
			o++;
		else 
			p++;

		z=n;
	}
	h=(float)u/z*100;
	j=(float)m/z*100;
	k=(float)o/z*100;
	l=(float)p/z*100;
	printf("1-18: %.2lf%\n",h);
	printf("19-35: %.2lf%\n",j);
	printf("36-60: %.2lf%\n",k);
	printf("60??: %.2lf%\n",l);
}