#include <stdio.h>
struct cost
{
    int n;
};
int main()
{
    struct cost c;
    scanf ("%d",&c.n);
    if(c.n<=0)
    {
        printf ("InValid input");
    }
    else
    if (c.n<6&&c.n>0)
    {
        float a=((c.n*100)*(1.0-0.10));
        printf ("%.2f",a);
    };
    int main()
    {
    else
    if(c.n<11&&c.n>5)
    {
        float b=((c.n*100)*(1.0-0.15));
        printf("%.2f",b);
    }
    else
    if(c.n>11)
    {
        float d=((c.n*100)*(1.0-0.20));
        printf ("%.2f",d);
    }
    else 
    {
        printf ("Invalid input");
    }
    }
    return 0;
    
}