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



