int main()
{
    int sm[100];
    int a=0,b=0,c=0,d=0,i,n;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
    scanf("%d",&sm[i]);
    if(sm[i]<=18){a++;}
    else if(sm[i]<=35){b++;}
    else if(sm[i]<=60){c++;}
    else{d++;}
    }
    printf("1-18: %.2lf%%\n",a*100.0/n);
    printf("19-35: %.2lf%%\n",b*100.0/n);
    printf("36-60: %.2lf%%\n",c*100.0/n);
    printf("60??: %.2lf%%\n",d*100.0/n);    
    return 0;
}
