#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",a);
    }
    else if(a.n<11&&a.n>5)
    {
        float b=((a.n*100)*(10-0.15),
        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;
}