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#!/usr/local/bin/node
//
// See https://theweeklychallenge.org/blog/perl-weekly-challenge-151
//
//
// Run as: node ch-2.js < input-file
//
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
let h = line . trim () . split (/ +/) . map (n => +n)
h [h . length] = 0
h [h . length] = 0
for (let i = h . length - 3; i >= 2; i --) {
h [i] = Math . max (h [i] + h [i + 2], h [i + 1])
}
console . log (h [0] + h [2])
})
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