#include<stdio.h>
int main()
{
    int n;
    float total;
    scanf("%d",&n);
    if (n < 1)
    {
        printf("Invalid input");
    }
    else if (n <= 5)
    {
        total = n * 100 * 0.9;
        printf("%.2f", total);
    }
    else if (n <= 10)
    {
        total = n * 100 * 0.85;
        printf("%.2f", total);
    }
    else 
    {
        total = n * 100 * 0.85;
        printf("%.2f", totat);
    }
    return 0;
}