import java.util.*;
class Main{
    static void sum(int p,float r)
    {
      float s1=p*r;
      System.out.printf("%.2f",s1);
    }
    public static void main(String args[])
    {
        Scanner s=new Scanner(System.in);
        String str=s.next();
        if(!hasNextInt())
        {
            System.out.println("Invalid input");
            return;
        }
        int p=s.nextInt();
         if(!hasNextFloat())
        {
            System.out.println("Invalid input");
            return;
        }
        float r=s.nextFloat();
        sum(p,r);
        
    }
}