public class Test
{
   static double KURS=3.8;
   
   public static void main(String[] args)throws IOException                   
   {                                                                          
      BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); 
                                                                              
      System.out.print("$: ");                                                
      String str=br.readLine();                                               
                                                                              
      double x=Double.parseDouble(str);                                       
      System.out.println("PLN: "+x*KURS);                                     
   }                                                                          
}