using System;

public class Program

{

    public static int FindMissingItem(int[] nums, int k) {

        int len = nums.Length;

        if (len == 1)

            return nums[0] + k;

​

        for (int i = 1; i < len; i++)

        {

            int missedNums = nums[i] - nums[i - 1] - 1;

            if (missedNums >= k)

                return nums[i - 1] + k;

​

            k -= missedNums;

        }

​

        return nums[len - 1] + k;

    }

    public static void Main()

    {

        Console.WriteLine("UniLecs");

        // tests

        Console.WriteLine(FindMissingItem(new int[] { 4, 7, 9, 10 }, 1)); // 5

        Console.WriteLine(FindMissingItem(new int[] { 4, 7, 9, 10 }, 3)); // 8

    }

}