题解 | #统计每个月兔子的总数#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

let total = 1;
let childenBirthMonth = []

const getChildren = (birthMonth, month) => {
    for (let i = birthMonth; i <= month; i++) {
        if (i - birthMonth >= 2) {
            total++;
            childenBirthMonth.push(i);
        }
    }
}

rl.on('line', function (line) {
    const month = parseInt(line);

    getChildren(1, month);

    for (let i = 0; i < childenBirthMonth.length; i++) {
        getChildren(childenBirthMonth[i], month);
    }

    console.log(total);
});