#include<stdio.h>
struct book
{
    int n;
};
int main()
{
    struct book a,
    scanf("%d",&a.n);
    if(a.n<=0)
    {
        printf("Invalid input");
    }
    else if(a.n<6 && a.n>0)
    {
        float a=((a.n*100)(1.0-0.10))
        printf("%.2f",b);}
        else if (a.n>11)
        {
            float c=((a.n*100)*(1.0-0.20))
            printf("%.2f",c);
        }
        else
        {
            printf("Invalid input");
        }
        return 0;
}