#include "bits/stdc++.h"
#define int long long
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 998244353;

// dp[i][j] := i番目の隙間まで見て, j個隙間にボールを入れたときの得点の最大値
int dp[2010][2010];
int prev_j[2010][2010];
signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N, M; cin >> N >> M;
	vector<int>A(N); for (int i = 0; i < N; i++)cin >> A[i];
	for (int i = 0; i < 2010; i++)for (int j = 0; j < 2010; j++)dp[i][j] = -INF;
	dp[0][0] = dp[0][1] = 0;
	for (int i = 0; i < N; i++) {
		for (int j = 0; j <= M; j++) {
			if (j % 2 == 1) {
				A[i] *= -1;
			}
			if (j < M) {
				if (dp[i + 1][j + 1] < dp[i][j] + A[i]) {
					dp[i + 1][j + 1] = dp[i][j] + A[i];
					prev_j[i + 1][j + 1] = j;
				}
			}
			if (dp[i + 1][j] < dp[i][j] + A[i]) {
				dp[i + 1][j] = dp[i][j] + A[i];
				prev_j[i + 1][j] = j;
			}
			if (j % 2 == 1) {
				A[i] *= -1;
			}
		}
	}
	cout << dp[N][M] << endl;
	return 0;

}