public static void main ( String [ ] args ) {
  Scanner scn = new Scanner ( System . in ) ;
  int t = scn . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = scn . nextInt ( ) ;
    int [ ] a = new int [ n + 1 ] ;
    int [ ] b = new int [ n + 1 ] ;
    for ( int i = 1 ;
    i <= n ;
    i ++ ) {
      a [ i ] = scn . nextInt ( ) ;
      b [ i ] = scn . nextInt ( ) ;
    }
    int [ ] tm = new int [ n + 1 ] ;
    for ( int i = 1 ;
    i <= n ;
    i ++ ) {
      tm [ i ] = scn . nextInt ( ) ;
    }
    int last = 0 ;
    int ans = 0 ;
    for ( int i = 1 ;
    i <= n ;
    i ++ ) {
      int arrival = a [ i ] - b [ i - 1 ] + last + tm [ i ] ;
      ans = arrival ;
      if ( arrival == a [ i ] ) {
        last = arrival + b [ i ] - a [ i ] ;
      }
      else {
        last = arrival + ( int ) Math . ceil ( ( b [ i ] - a [ i ] ) / 2.0 ) ;
      }
    }
    System . out . println ( ans ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scn = new Scanner ( System . in ) ; int t = scn . nextInt ( ) ; while ( t -- > 0 ) { int n = scn . nextInt ( ) ; int [ ] a = new int [ n + 1 ] ; int [ ] b = new int [ n + 1 ] ; for ( int i = 1 ; i <= n ; i ++ ) { a [ i ] = scn . nextInt ( ) ; b [ i ] = scn . nextInt ( ) ; } int [ ] tm = new int [ n + 1 ] ; for ( int i = 1 ; i <= n ; i ++ ) { tm [ i ] = scn . nextInt ( ) ; } int last = 0 ; int ans = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { int arrival = a [ i ] - b [ i - 1 ] + last + tm [ i ] ; ans = arrival ; if ( arrival == a [ i ] ) { last = arrival + b [ i ] - a [ i ] ; } else { last = arrival + ( int ) Math . ceil ( ( b [ i ] - a [ i ] ) / 2.0 ) ; } } System . out . println ( ans ) ; } }
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arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (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 (expression_statement (assignment_expression left: (array_access 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left: (identifier) right: (decimal_integer_literal)))) right: (identifier)) right: (array_access array: (identifier) index: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) right: (array_access array: (identifier) index: (identifier)))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (parenthesized_expression (binary_expression 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