Start 2026-04-24 13:34:57

【2027省选】20260424模拟赛更正

End 2026-04-30 00:00:00
Contest is over.
Now 2026-07-19 21:28:54

A. 【BJ】T1

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
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                        Time Limit
                        
                            3 seconds                        
                    

                    

                        Memory Limit
                        1024 MB
                    

                    
                

            


            
                 Submit