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