#include<stdio.h>
int main ()
{
    int quantity;
    scanf("%d", &quantity);
    if(quantity < 0)
    {
        printf("Invalid input");
        return 0;
    }
    float price = quantity * 100.0;
    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 total = price - (price * discount);
    price("%.2f", total);
    return 0;
}