int main(){
	int n,i,a=0,b=0,c=0,d=0;
	double x=0,y=0,z=0,w=0;
	int nl[100];
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d",&nl[i]);
		if(nl[i]>0&&nl[i]<19){
			a++;}
		else if(nl[i]>18&&nl[i]<36){
			b++;}
		else if(nl[i]>35&&nl[i]<61){
			c++;}
		else if(nl[i]>60){
			d++;}
	}
	x=1.0*a/n*100;
	y=1.0*b/n*100;
	z=1.0*c/n*100;
	w=1.0*d/n*100;
	printf("1-18: %.2lf%%\n",x);
	printf("19-35: %.2lf%%\n",y);
	printf("36-60: %.2lf%%\n",z);
	printf("60??: %.2lf%%\n",w);
	return 0;
}