#include<stdio.h>
int main()
{
    int quantity;
    float total, discountRate;
    scanf("%d", &quantity);
    if (quantity < 0)
    {
        printf("Invalid input\n");
        return 0;
    }
    if (quantity >=1 && quantity <=5)
    {
        discountRate = 0.10;
    }
if(quantity >=6 && quantity <= 10);
    {
    discountRate = 0.15;
}
else if(quantity > 10);
{
    discountRate = 0.0;
}
total = quantity * 100 * (1 - discountRate);
printf("%.2f\n", total);
return 0;
}