Start 2023-08-09 14:00:00

23暑C1班测试

End 2023-08-09 16:00:00
Contest is over.
Now 2025-05-13 01:48:13

A. class

Description

请看纸质或pdf题面。

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
Submit

            

                                                            

  
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                        Time Limit
                        
                            1 second                        
                    

                    

                        Memory Limit
                        128 MB
                    

                    
                

            


            
                 Submit