[백준] 3052 Node.js

const fs = require('fs');
const input = fs.readFileSync("/dev/stdin").toString().trim().split("\n").map(Number);

const obj = {}
input.forEach((n, i) => {
    obj[n%42] = obj[n%42]? obj[n%42] +1 : 1 
})

console.log(Object.keys(obj).length)