import java.util.*;
public class totalparkingfee{
    public static void main(String[]args){
        Scanner input = new Scanner(System.in);
        int hoursParked = input.nextInt();
        float hourlyRate = input.nextFloat();
        try{
             System.out.printf("%.2f",result);
             
              if (hoursParked < 0 || hoursParked > 24 || hourlyRate < -10 || hourlyRate > 10) {
                System.out.println("Invalid input");
                return;
              }
                      float result = hoursParked*hourlyRate;

            
        }
        catch(Exception e){
             System.out.printf("Invalid input");
        }
    }
}