int main(){
	int n;
	int a;
	double sum1=0.0;
	double sum2=0.0;
	double sum3=0.0;
	double sum4=0.0;
	scanf("%d",&n);
	for(int i=0;i<n;i++){
			scanf("%d",&a);
	if(a>=1&&a<=18){
		sum1+=1.0;
	}
	else if(a>=19&&a<=35){
		sum2+=1.0;
	}
    else if(a>=36&&a<=60){
		sum3+=1.0;
	}
	else if(a>60){
		sum4+=1.0;
	}
	}
    printf("1-18: %.2lf%%\n",(double)(sum1/n)*100.0);
    printf("19-35: %.2lf%%\n",(double)(sum2/n)*100.0);
    printf("36-60: %.2lf%%\n",(double)(sum3/n)*100.0);
    printf("60??: %.2lf%%\n",(double)(sum4/n)*100.0);
	return 0;
}