public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int x = sc . nextInt ( ) - 1 ;
  int [ ] h = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    h [ i ] = sc . nextInt ( ) ;
  }
  ArrayList < Integer > [ ] table = new ArrayList [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    table [ i ] = new ArrayList < > ( ) ;
  }
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    int a = sc . nextInt ( ) - 1 ;
    int b = sc . nextInt ( ) - 1 ;
    table [ a ] . add ( b ) ;
    table [ b ] . add ( a ) ;
  }
  dfs ( x , - 1 , h , table ) ;
  System . out . println ( ret ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int x = sc . nextInt ( ) - 1 ; int [ ] h = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { h [ i ] = sc . nextInt ( ) ; } ArrayList < Integer > [ ] table = new ArrayList [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { table [ i ] = new ArrayList < > ( ) ; } for ( int i = 0 ; i < n - 1 ; i ++ ) { int a = sc . nextInt ( ) - 1 ; int b = sc . nextInt ( ) - 1 ; table [ a ] . add ( b ) ; table [ b ] . add ( a ) ; } dfs ( x , - 1 , h , table ) ; System . out . println ( ret ) ; }
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