int main(){
	int n,i,a[100],sum1=0,sum2=0,sum3=0,sum4=0;
	scanf("%d\n",&n);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for(i=0;i<n;i++){
		if(a[i]<=18)
			sum1+=1;
		else if(a[i]<=35&&a[i]>=19)
			sum2+=1;
		else if(a[i]<=60&&a[i]>=36)
			sum3+=1;
		else if(a[i]>60)
			sum4+=1;
	}
	double p1,p2,p3,p4;
	p1=(double)100*(double)sum1/n;
    p2=(double)100*(double)sum2/n;
    p3=(double)100*(double)sum3/n;
    p4=(double)100*(double)sum4/n;
  	printf("1-18: %.2lf%\n",p1);
    printf("19-35: %.2lf%\n",p2);
    printf("36-60: %.2lf%\n",p3);
    printf("60??: %.2lf%\n",p4);
	return 0;
}
