  int main(){
	  int n,m,a=0,b=0,c=0,d=0,i=1;
	  double e,f,g,h;
	  scanf("%d",&n);
	  for(i=1;i<=n;i++){
	scanf("%d",&m);
	if(m>0&&m<=18){
			  a+=1;
		  }else if(m>18&&m<=35){
		  b+=1;
			  }else if(m>35&&m<=60){
				  c+=1;
			  }else if(m>60){
				  d+=1;
			  }
	  }
	  printf("1-18: %.2lf%%\n",e=100.00*a/n);
	  printf("19-35: %.2lf%%\n",f=100.00*b/n);
	  printf("36-60: %.2lf%%\n",g=100.00*c/n);
	  printf("60??: %.2lf%%\n",h=100.00*d/n);
	  return 0;
  }