#include<stdio.h>
int main()
{
    int quantity;
    scanf("%d",&quantity);
    if(quantity<0)
    {
        printf("Invalid  input");
        return 0;
    }
    
    float price=100.0;
    float total=quantity*price;
    float discount=0.0;
    if(quantity>=1&&quantity<=5)
    {
        discount=0.10
    }
    else if(quantity>=6&&quantity<=10)
    {
        discount=0.15;
    }
    else if(quantity>10)
    {
        discount=0.20;
    }
    float finalAmount=total-total-(total*discount);
    printf("%.2f",finalAmount);
    return 0;
}