public static void main ( String [ ] args ) {
  int n = in . nextInt ( ) ;
  graph = new Set [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) graph [ i ] = new HashSet < > ( ) ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    int a = in . nextInt ( ) - 1 ;
    int b = in . nextInt ( ) - 1 ;
    graph [ a ] . add ( b ) ;
    graph [ b ] . add ( a ) ;
  }
  written = new long [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) written [ i ] = in . nextInt ( ) ;
  long [ ] answer = dfs ( 0 , - 1 ) ;
  out . println ( abs ( answer [ 0 ] ) + abs ( answer [ 1 ] ) ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) { int n = in . nextInt ( ) ; graph = new Set [ n ] ; for ( int i = 0 ; i < n ; i ++ ) graph [ i ] = new HashSet < > ( ) ; for ( int i = 0 ; i < n - 1 ; i ++ ) { int a = in . nextInt ( ) - 1 ; int b = in . nextInt ( ) - 1 ; graph [ a ] . add ( b ) ; graph [ b ] . add ( a ) ; } written = new long [ n ] ; for ( int i = 0 ; i < n ; i ++ ) written [ i ] = in . nextInt ( ) ; long [ ] answer = dfs ( 0 , - 1 ) ; out . println ( abs ( answer [ 0 ] ) + abs ( answer [ 1 ] ) ) ; out . close ( ) ; }
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