MaxSumOfK

using System;

class MaxSumOfK
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int k = int.Parse(Console.ReadLine());

        // Read the array
        int[] array = new int[n];

        for (int i = 0; i < n; i++)
        {
            array[i] = int.Parse(Console.ReadLine());
        }

        // Compair
        int currentSum = 0;
        int sum = 0;

        for (int i = 0; i < array.Length - k + 1; i++)
        {
            for (int e = 0; e < k; e++)
            {
                currentSum += array[i + e];
            }
            if (currentSum >= sum)
            {
                sum = currentSum;
                currentSum = 0;
            }
            else
            {
                currentSum = 0;
            }
        }
        Console.WriteLine(sum);
    }
}