#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int INF = INT_MAX / 2;

int main() {
	int n, m; cin >> n >> m;
	vector<int> a(n);
	for (int i = 0; i < n; i++)
		cin >> a[i];
	int ma = -INF;
	{
		vector<int> dp0(m + 1, -INF), dp1(m + 1, -INF);
		dp0[0] = 0;
		for (int i = 1; i < n; i++) {
			vector<int> _dp0(m + 1, -INF), _dp1(m + 1, -INF);
			for (int j = 0; j <= m; j++) {
				_dp0[j] = max(_dp0[j], dp0[j]);
				_dp0[j] = max(_dp0[j], dp1[j]);
				if (j + 1 <= m) {
					_dp1[j + 1] = max(_dp1[j + 1], dp0[j]);
					_dp1[j + 1] = max(_dp1[j + 1], dp1[j] + a[i - 1]);
				}
			}
			dp0 = _dp0; dp1 = _dp1;
		}
		ma = max(ma, dp0[m]);
		ma = max(ma, dp1[m]);
	}
	if (m)
	{
		vector<int> dp0(m + 1, -INF), dp1(m + 1, -INF);
		dp1[1] = 0;
		for (int i = 1; i < n; i++) {
			vector<int> _dp0(m + 1, -INF), _dp1(m + 1, -INF);
			for (int j = 0; j <= m; j++) {
				_dp0[j] = max(_dp0[j], dp0[j]);
				_dp0[j] = max(_dp0[j], dp1[j]);
				if (j + 1 <= m) {
					_dp1[j + 1] = max(_dp1[j + 1], dp0[j]);
					_dp1[j + 1] = max(_dp1[j + 1], dp1[j] + a[i - 1]);
				}
			}
			dp0 = _dp0; dp1 = _dp1;
		}
		ma = max(ma, dp0[m]);
		ma = max(ma, dp1[m] + a[n - 1]);
	}
	cout << ma << endl;
}