int main()
{
	int n,i;
	double a=0.0,b=0.0,c=0.0,d=0.0;
	int age[100];
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d",&age[i]);
		if(age[i]<=18)
			a++;
		else if(age[i]<=35)
			b++;
		else if(age[i]<=60)
			c++;
		else
			d++;
	}
	printf("1-18: %.2f%%\n",a/n*100);
	printf("19-35: %.2f%%\n",b/n*100);
	printf("36-60: %.2f%%\n",c/n*100);
	printf("60??: %.2f%%\n",d/n*100);

         
}

