int main(){
	int n,i,s1=0,s2=0,s3=0,s4=0,a[100];
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for(i=0;i<n;i++){
		if(a[i]<19){
			s1++;
		}
        if((a[i]>18)&&(a[i]<36)){
			s2++;
		}
        if((a[i]>35)&&(a[i]<61)){
			s3++;
		}
        if(a[i]>60){
			s4++;
		}
	}
	printf("1-18: %.2f%%\n",(float)s1*100/n);
    printf("19-35: %.2f%%\n",(float)s2*100/n);
    printf("36-60: %.2f%%\n",(float)s3*100/n);
    printf("60??: %.2f%%\n",(float)s4*100/n);
	return 0;
}