using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the number and exponent to find sum of 1 – X + X2 –X3 ….XN series");

        int number = Convert.ToInt32(Console.ReadLine());

        int exponent = Convert.ToInt32(Console.ReadLine());

        int sum = 1, term = 1;

        for (int incrementVariable = 1; incrementVariable <= number; incrementVariable = incrementVariable + 1)

        {

            term = -term * exponent;

            sum = sum + term;

        }

​

        Console.WriteLine("Sum of Series from given number {0} with exponent {1} : {2}", exponent, number, sum);

    }

}