Start 2024-03-31 13:13:47

【2025省选前】20240331更正

End 2024-04-20 00:00:00
Contest is over.
Now 2026-04-18 22:56:41

A. 【BJ】T1

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
Submit

            

                                                            

  
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                        Time Limit
                        
                            3 seconds                        
                    

                    

                        Memory Limit
                        256 MB
                    

                    
                

            


            
                 Submit