import java.util.*;
class Parking
{
    int houseParked=0;
    float hourlyRate=0;
    Parking(int houseParked,float hourlyRate)
    {
        this.houseParked=houseParked;
        this.hourlyRate=hourlyRate;
    }
    void parkingFee()
    {
        System.out.printf("%.2f",hourlyRate*houseParked);
    }
}
public class Main
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        if(houseParked<=0||hourlyRate<=0)
        {
            System.out.println("Invalid input");
            return;
        }
        float hourlyRate=scan.nextFloat();
        int houseParked=scan.nextInt();
        Parking p=new Parking(houseParked,hourlyRate);
        p.parkingFee();
    }
}