// editor14
import java.util.*;
class col {
    public static void main(String[]args) {
        Scanner sc = new Scanner(System.in);
        String s=sc.nextLine();
        int n = sc.nextInt();
        if(n<0) {
            System.out.println("Invalid input");
            return;
        }
        float price = sc.nextFloat();
        if(name.length()==0||price<1000 || n<=0 ) {
            System.out.println("Invalid input");
            return;
        }
        float total = price + (0.2f*price);
        System.out.printf("%.2f",total);
    }
}