#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<5||a.n>1)
    {
        float a=(a.n*100)*(1.0-0.10);
        printf("%.2f",a);
    } 
    else if (a.n<10||a.n>5)
    {
        float b=(a.n*100)*(1.0-0.15);
        printf("%.2f",b);
    }
    else if(a.n>10)
    {
        float c=((a.n*100)*(1.0-0.20));
        printf("%.2f",c);
    }
    else
    {
        printf("Invalid Input");
    }
    return 0;
}