50. 求最多可以派出多少支团队

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
let totalPeople;
let abilities;
let minAbility;
rl.on('line', function(line) {
    if (!totalPeople) {
        totalPeople = parseInt(line);
    } else if (!abilities) {
        abilities = line.split(' ').map(Number);
    } else if (!minAbility) {
        minAbility = parseInt(line);
        abilities.sort((a, b) => a-b);

        let left = 0;
        let right = totalPeople - 1;
        let res = 0;
        while(left < right) {
            if (abilities[right] >= minAbility) {
                res += 1;
                right -= 1;
            } else if (abilities[right] + abilities[left] >= minAbility) {
                res += 1;
                right -= 1;
                left += 1;
            } else {
                left += 1;
            }
        }
        if (left === right && abilities[left] >= minAbility) {
            res += 1;
        }
        console.log(res)
    }
});