
int main(int argc, char* argv[])
{
	int n;
	scanf("%d",&n);
	int a[101];
	double q=0,w=0,e=0,r=0;
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
		if(a[i]<=18){
			q++;}
		if(a[i]<=35&&a[i]>=19){
			w++;}
		if(a[i]<=60&&a[i]>=36){
			e++;}
		if(a[i]>=61){
			r++;}
	}
	printf("1-18: %.2lf%%\n",q/n*100);
	printf("19-35: %.2lf%%\n",w/n*100);
	printf("36-60: %.2lf%%\n",e/n*100);
	printf("60??: %.2lf%%\n",r/n*100);


	return 0;
}
