public static void main ( String [ ] args ) throws IOException {
  BufferedReader reader = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  int n = Integer . parseInt ( reader . readLine ( ) ) ;
  graph = new ArrayList [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) graph [ i ] = new ArrayList < > ( ) ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    StringTokenizer sToken = new StringTokenizer ( reader . readLine ( ) ) ;
    int x = Integer . parseInt ( sToken . nextToken ( ) ) - 1 ;
    int y = Integer . parseInt ( sToken . nextToken ( ) ) - 1 ;
    graph [ x ] . add ( y ) ;
    graph [ y ] . add ( x ) ;
  }
  arr = new long [ n ] ;
  StringTokenizer sToken = new StringTokenizer ( reader . readLine ( ) ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) arr [ i ] = Integer . parseInt ( sToken . nextToken ( ) ) ;
  long [ ] res = dfs ( 0 , - 1 ) ;
  System . out . println ( ( res [ 0 ] * ( - 1 ) ) + res [ 1 ] ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader reader = new BufferedReader ( new InputStreamReader ( System . in ) ) ; int n = Integer . parseInt ( reader . readLine ( ) ) ; graph = new ArrayList [ n ] ; for ( int i = 0 ; i < n ; i ++ ) graph [ i ] = new ArrayList < > ( ) ; for ( int i = 1 ; i < n ; i ++ ) { StringTokenizer sToken = new StringTokenizer ( reader . readLine ( ) ) ; int x = Integer . parseInt ( sToken . nextToken ( ) ) - 1 ; int y = Integer . parseInt ( sToken . nextToken ( ) ) - 1 ; graph [ x ] . add ( y ) ; graph [ y ] . add ( x ) ; } arr = new long [ n ] ; StringTokenizer sToken = new StringTokenizer ( reader . readLine ( ) ) ; for ( int i = 0 ; i < n ; i ++ ) arr [ i ] = Integer . parseInt ( sToken . nextToken ( ) ) ; long [ ] res = dfs ( 0 , - 1 ) ; System . out . println ( ( res [ 0 ] * ( - 1 ) ) + res [ 1 ] ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (type_identifier) dimensions: (dimensions_expr (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) right: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) right: (decimal_integer_literal)))) (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier)))))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (decimal_integer_literal) (unary_expression operand: (decimal_integer_literal)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (parenthesized_expression (unary_expression operand: (decimal_integer_literal))))) right: (array_access array: (identifier) index: (decimal_integer_literal))))))))