package no324;

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		if (m <= 1) {
			System.out.println(0);
			return;
		}
		int[] w = new int[n];
		for(int i=0;i<n;i++) {
			w[i] = sc.nextInt();
		}
		int[][][][] dp = new int[2][2][n][m+1]; //first, before, ind, count
		for(int i=0;i<2;i++) {
			for(int j=0;j<2;j++) {
				for(int k=0;k<n;k++) {
					Arrays.fill(dp[i][j][k], -(1<<29));
				}
			}
		}
		dp[0][0][0][0] = 0;
		dp[1][1][0][1] = 0;
		for(int i=0;i<n-1;i++) {
			for(int fir=0;fir<2;fir++) {
				for(int bef=0;bef<2;bef++) {
					for(int j=0;j<=m;j++) {
						if (dp[fir][bef][i][j] == -(1<<29)) {
							continue;
						}
						//取る
						if (j < m) {
							int nj = dp[fir][bef][i][j] + (bef == 1 ? w[i] : 0) + (i == n - 2 && fir == 1 ? w[n-1] : 0);
//							System.out.println(fir + "," + bef + "," + i + "," + j + ":" + dp[fir][bef][i][j] + "->" + fir + "," + 1 + "," + (i+1) + "," + (j+1) + ":" + nj);
							dp[fir][1][i+1][j+1] = Math.max(dp[fir][1][i+1][j+1], nj);
						}
						//取らない
						dp[fir][0][i+1][j] = Math.max(dp[fir][0][i+1][j], dp[fir][bef][i][j]);
//						System.out.println(fir + "," + bef + "," + i + "," + j + ":" + dp[fir][bef][i][j] + "->" + fir + "," + 0 + "," + (i+1) + "," + j + ":" + dp[fir][bef][i][j]);
					}
				}
			}
		}
		int ans = Integer.MIN_VALUE;
		for(int fir=0;fir<2;fir++) {
			for(int bef=0;bef<2;bef++) {
				ans = Math.max(ans, dp[fir][bef][n-1][m]);
			}
		}
		System.out.println(ans);
	}

}