int main()
{
int i;
double n,a=0,b=0,c=0,d=0,x;
scanf("%lf\n",&n);
for(i=1;i<=n;i++)
{scanf("%lf",&x);
if(x<=18){a+=1;}
if((x>=19)&&(x<=35)){b+=1;}
if((x>=36)&&(x<=60)){c+=1;}
if(x>=61){d+=1;}
}
printf("1-18: %.2lf%\n19-35: %.2lf%\n36-60: %.2lf%\n60??: %.2lf%\n",100*a/n,100*b/n,100*c/n,100*d/n);
return 0;
}