Start 2024-05-08 12:30:00

【2025省选前】20240508更正

End 2024-05-25 00:00:00
Contest is over.
Now 2026-04-18 22:56:28

A. 【BJ】T1

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
Submit

            

                                                            

  
Login

  

    

        




        




        

                        Signup        

    
  



                                                

        

        

            

                
                

                    
                    

                        Time Limit
                        
                            1 second                        
                    

                    

                        Memory Limit
                        256 MB
                    

                    
                

            


            
                 Submit