int main()
{
	int n,a[100],i,d1=0,d2=0,d3=0,d4=0;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		if(a[i]<=18){
			d1+=1;
		}
		else if(a[i]<=35){
			d2++;
		}
		else if(a[i]<=60){
			d3++;
		}
		else{
			d4++;
		}
	}
	double b1,b2,b3,b4;
	b1=(double)d1/n;
	b2=(double)d2/n;
	b3=(double)d3/n;
	b4=(double)d4/n;
	printf("1-18: %.2lf%%\n",b1*100);
	printf("19-35: %.2lf%%\n",b2*100);
	printf("36-60: %.2lf%%\n",b3*100);
	printf("60??: %.2lf%%\n",b4*100);
	return 0;
}