using System;

​

/*

Genady likes to play with numbers and he has n numbers. 

One day he was placing the numbers on the playing board just to count that how many numbers he have. 

He was placing the numbers in increasing order i.e. from 1 to n. 

But when he was putting the numbers back into his bag, some numbers fell down onto the floor. 

He picked up all the numbers but one number, he couldn't find. Now he have to go somewhere urgently, so he asks you to find the missing number.

​

Write a function that accepts an array of integer and returns the missing number.

Test cases:

[1, 4, 3] => 2

[2, 5, 3, 1] => 4

*/

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}