#include<stdio.h>
int main()
{
    int quantity;
    scanf("%d",&quantity);
    if(quantity < 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 finalAmount=total-(total*discount);
        printf("%.2f",final Amount);
        return 0;
        
}