using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
	class Program
	{
		static void Main(string[] args)
		{
			new Program().Solve();
		}

		void Solve()
		{
			string[] tmp = Console.ReadLine().Split();
			int n = int.Parse(tmp[0]);
			int m = int.Parse(tmp[1]);
			int[] w = Console.ReadLine().Split().Select(int.Parse).ToArray();

			const int Inf = (int)1e9;

			var dp = new int[3030, 3030, 2, 2];
			for (int i = 0; i < 3030; i++)
			for (int j = 0; j < 3030; j++)
			for (int k = 0; k < 2; k++)
			for (int l = 0; l < 2; l++)
				dp[i, j, k, l] = -Inf;

			dp[0, 0, 0, 0] = dp[0, 1, 1, 1] = 0;

			for (int i = 1; i < n; i++)
			for (int j = 0; j <= m; j++)
			for (int k = 0; k <= 1; k++)
			for (int l = 0; l <= 1; l++)
			{
				dp[i, j, 0, l] = Math.Max(dp[i, j, 0, l], dp[i - 1, j, k, l]);
				dp[i, j + 1, 1, l] = Math.Max(dp[i, j + 1, 1, l], dp[i - 1, j, k, l] + w[i] * k);
			}
			int ans = -Inf;
			for (int k = 0; k <= 1; k++)
				for (int l = 0; l <= 1; l++)
					ans = Math.Max(ans, dp[n - 1, m, k, l] + k * l * w[0]);
			Console.WriteLine(ans);
		}
	}
}