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#!/usr/local/bin/node
//
// See https://theweeklychallenge.org/blog/perl-weekly-challenge-152
//
//
// Run as: node ch-2.js < input-file
//
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
let [a_x1, a_y1, a_x2, a_y2, b_x1, b_y1, b_x2, b_y2] =
line . trim () . split (/ +/) . map (n => +n)
console . log ( (Math . max (a_x1, a_x2) - Math . min (a_x1, a_x2)) *
(Math . max (a_y1, a_y2) - Math . min (a_y1, a_y2)) +
(Math . max (b_x1, b_x2) - Math . min (b_x1, b_x2)) *
(Math . max (b_y1, b_y2) - Math . min (b_y1, b_y2)) -
Math . max (0, Math . min (Math . max (a_x1, a_x2), Math . max (b_x1, b_x2)) -
Math . max (Math . min (a_x1, a_x2), Math . min (b_x1, b_x2))) *
Math . max (0, Math . min (Math . max (a_y1, a_y2), Math . max (b_y1, b_y2)) -
Math . max (Math . min (a_y1, a_y2), Math . min (b_y1, b_y2))))
})
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