1608

/**
 * @param {number[]} nums
 * @return {number}
 */
var specialArray = function (nums) {
    let count = 0;
    for (let i = 1; i <= 1000; i++) {
        for (let num of nums) {
            if (num >= i) count++;
        }

        if (count === i) return i;

        count = 0;
    }

    return -1;
};