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