public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int x = 0 , n = s . nextInt ( ) , i , m , ans = 0 ;
  boolean j = false ;
  for ( i = 0 ;
  i < n ;
  i ++ ) x = x + s . nextInt ( ) ;
  m = s . nextInt ( ) ;
  int [ ] c = new int [ m ] ;
  int [ ] b = new int [ m ] ;
  for ( i = 0 ;
  i < m ;
  i ++ ) {
    c [ i ] = s . nextInt ( ) ;
    b [ i ] = s . nextInt ( ) ;
  }
  for ( i = 0 ;
  i < m ;
  i ++ ) {
    if ( x >= c [ i ] && x <= b [ i ] ) {
      ans = x ;
      j = true ;
      break ;
    }
    else if ( x < c [ i ] ) {
      ans = c [ i ] ;
      j = true ;
      break ;
    }
  }
  if ( j == true ) System . out . print ( ans ) ;
  else System . out . print ( - 1 ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int x = 0 , n = s . nextInt ( ) , i , m , ans = 0 ; boolean j = false ; for ( i = 0 ; i < n ; i ++ ) x = x + s . nextInt ( ) ; m = s . nextInt ( ) ; int [ ] c = new int [ m ] ; int [ ] b = new int [ m ] ; for ( i = 0 ; i < m ; i ++ ) { c [ i ] = s . nextInt ( ) ; b [ i ] = s . nextInt ( ) ; } for ( i = 0 ; i < m ; i ++ ) { if ( x >= c [ i ] && x <= b [ i ] ) { ans = x ; j = true ; break ; } else if ( x < c [ i ] ) { ans = c [ i ] ; j = true ; break ; } } if ( j == true ) System . out . print ( ans ) ; else System . out . print ( - 1 ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (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: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (false))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (identifier) right: (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: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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 (identifier))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) right: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (true))) (break_statement)) alternative: (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: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (true))) (break_statement)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (true))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal))))))))