// editor4
#include <stdio.h>
int main()
{
    int quantity;
    scanf("%d",&quantity);
    if(quatity < 0)
    {
        printf("Invalid input");
        return 0;
    }
    float price=100.0;
    float total=quantity*price;
    float discount=0.0;
    if(quantity >= 1 && quantity <= 5)
    {
        discount=0.10;
    }
    else if(quantity >=6 && quantity <=10)
    {
        discount=0.15;
    }
    else if(quantity > 10)
    {
        discount = 0.20;
    }
    float finalAccount=total - (total*discount);
    printf("%.2f",finaldiscount);
    return 0;
}