题解 | 尼科彻斯定理
const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
void async function () {
// Write your code here
const num = await readline()
let start = num * (num - 1) + 1
const res = [start]
for(let i=1; i<num; i++) {
start += 2
res.push(start)
}
console.log(res.join("+"))
}()
