#include<stdio.h>
struct books
{
    int n;
};
int main()
{
    struct books a;
    scanf("%d",&a.n);
    if(a.n<0)
    {
        printf("Invalid input");
    }
    else if(a.n<5||a.n>0) 
    {
        float a=((a.n*100)*(1.0-0.10))
        printf("%.2f",a);
    }
    else if(a.n<11||a.n>5)
    {
        float b=((a.n*100)*(1.0-0.15))
        printf("%.2f",b);
    }
    else if(a.n>11)
    {
        float c=((a.n*100)*(1.0-0.20))
        printf("%.2f",c);
    }
    else
    {
        printf("Inv")
    }
    
}