#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <sstream>
#include <string>
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define var auto
#define mod 1000000007
#define inf 2147483647
#define nil -1
#define mp make_pair
typedef long long ll;
using namespace std;

template <typename T>
inline void output(T a, int p) {
    if(p){
        cout << fixed << setprecision(p)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}
// end of template

int main() {
    cin.tie(0);
    // source code
    int N, M;
    cin >> N >> M;
    vector<int> W(N);
    rep(i, N){
        cin >> W[i];
    }
    
    vector<vector<vector<vector<ll>>>> dp(N, vector<vector<vector<ll>>> (N + 1,  vector<vector<ll>>(2, vector<ll> (2, -inf)))); // [いくつまで選んだか][何個選んだか][今いる頂点を選んだか][0番目を選んだか]
    dp[0][0][0][0] = 0; dp[0][1][1][1] = 0;

    repd(i, 1, N){
        rep(j, i + 2){
            rep(z, 2){
                dp[i][j][0][z] = max(dp[i - 1][j][0][z], dp[i - 1][j][1][z]);
                if(j) dp[i][j][1][z] = max(dp[i - 1][j - 1][0][z], dp[i - 1][j - 1][1][z] + W[i - 1]);
            }
            
        }
    }
    rep(j, N + 1){
        rep(z, 2){
            dp[N - 1][j][0][z] = max(dp[N - 2][j][0][z], dp[N - 2][j][1][z]);
        }
        if(j){
            dp[N - 1][j][1][1] = max(dp[N - 2][j - 1][0][1], dp[N - 2][j - 1][1][1] + W[N - 2]) + W[N - 1];
            dp[N - 1][j][1][0] = max(dp[N - 2][j - 1][0][0], dp[N - 2][j - 1][1][0] + W[N - 2]);
        }
    }
    
    ll ret = -inf;
    rep(y, 2) rep(z, 2) ret = max(ret, dp[N - 1][M][y][z]);
    
    output(ret, 0);
    
    
    
    return 0;
}