function isCyclicQuadrilateral(a, b, c, d) {
    return (a + b + c > d) &&
           (a + b + d > c) &&
           (a + c + d > b) &&
           (b + c + d > a);
}

console.log(process.argv.length)

if(process.argv.length !== 6) {
    console.error('Hiba! 4 számot meg kell adni');
    process.exit(1);
}

const a = Number(process.argv[2]);
const b = Number(process.argv[3]);
const c = Number(process.argv[4]);
const d = Number(process.argv[5]);

if (isCyclicQuadrilateral(a, b, c, d)) {
    console.log(`OK húrnégyszög: ${a} ${b} ${c} ${d}`);
} else {
    console.log(`Nem, nem húrnégyszög: ${a} ${b} ${c} ${d}`);
}