9999018 - 最小生成树 (mst)

Input

Output

Examples

Input


                

                

                    
Output

                    

                


                
                            

        


        
                    
Source

            

                
USACO11NOV Cow Beauty Pageant S


            

            

        

        

            
            

                
                

                    Time Limit
                    
                        1 second                    
                

                

                    Memory Limit
                    128 MB
                

                
            

        


        


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