Start 2026-05-29 14:42:59

【2026CSP】20260527模拟赛更正

End 2026-06-20 00:00:00
Contest is over.
Now 2026-08-24 09:38:03

D. 【S】T4

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
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                        Time Limit
                        
                            1 second                        
                    

                    

                        Memory Limit
                        512 MB
                    

                    
                

            


            
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