int main()
{
	int i,n,a[100],b1,b2,b3,b4;
	double s1,s2,s3,s4;
	scanf("%d",&n);
	b1=b2=b3=b4=0;
	for(i=0;i<n;i++)
	{
		scanf("%d",&a[i]);
		if(a[i]<19)
			b1++;
		if(a[i]>18&&a[i]<36==1)
			b2++;
		if(a[i]>35&&a[i]<61==1)
			b3++;
		if(a[i]>60)
			b4++;
	}
	s1=(double)(b1)/(double)(n)*100;
	s2=(double)b2/(double)n*100;
	s3=(double)b3/(double)n*100;
	s4=(double)b4/(double)n*100;
	printf("1-18: %.2lf%%\n",s1);
	printf("19-35: %.2lf%%\n",s2);
	printf("36-60: %.2lf%%\n",s3);
	printf("60??: %.2lf%%\n",s4);
	return 0;
}