import java.util.*;
class Park
{
    int hrspark;
    float hrlyrate;
    Park(int a,float b)
    {
        hrspark=a;
        hrlyrate=b;
    }
    void calculate()
    {
        float tot=hrspark*hrlyrate;
        System.out.printf("%.2f",tot);
    }
}
class Main{
    public static void main(String[] args)
    {
        Scanner s=new Scanner(System.in);
        int hr=s.nextInt();
        if(!s.hasNextFloat)
        {
            System.out.print("Invalid input");
            return;
        }
        float rate=s.nextFloat();
        Park obj=new Park(hr,rate);
        obj.calculate();
    }
}