#include<stdio.h>
int main()
{
    int quality;
    float total, discountRate;
    scanf("%d", &quality);
    if (quality < 0)
    {
        printf("Invalid input\n");
        return 0;
    }
    if (quantity >= 1 && quantity <= 5)
    {
        discountRate = 0.10;
    }
    else if(quantity >= 6 && quantity <= 10)
    {
        discountRate = 0.15;
    }
    else if(quantity > 10)
    {
        discountRate = 0.20;
    }
    else
    {
        discountRate = 0.0;
    }
    total = quantity * 100 * (1 - discountRate);
    printf("%.2f\n", total);
    return 0;
}