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#!/usr/local/bin/node
//
// See ../README.md
//
//
// Run as: node ch-2.js < input-file
//
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
let [i, j, k] = line . split (" ") . map (_ => +_)
let n = 0
while (k > 0) {
n ++
let s = Math . floor (Math . sqrt (n))
for (let d = 1; d <= s && k > 0; d ++) {
if (n % d == 0) {
if (d <= i && n / d <= j) {k --}
if (d <= j && n / d <= i) {k --}
if (n == d * d) {k ++}
}
}
}
console . log (n)
})
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