Start 2023-08-09 16:15:00

23暑D1班测试

End 2023-08-09 18:15:00
Contest is over.
Now 2025-10-04 10:42:55

A. class

Description

请看纸质或pdf题面。

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                            

            
Submit

            

                                                            

  
Login

  

    

        




        




        

                        Signup        

    
  



                                                

        

        

            

                
                

                    
                    

                        Time Limit
                        
                            1 second                        
                    

                    

                        Memory Limit
                        128 MB
                    

                    
                

            


            
                 Submit