#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <cmath>

using namespace std;

#define FOR(x,y) for(int x = 0;x < y;x++)
#define LLI long long int

template<int um> class UF {
public:
    vector<int> par,rank,cnt;
    UF() {par=rank=vector<int>(um,0); cnt=vector<int>(um,1); for(int i=0;i<um;i++) par[i]=i;}
    void reinit() {FOR(i,um) rank[i]=0,cnt[i]=1,par[i]=i;}
    int operator[](int x) {return (par[x]==x)?(x):(par[x] = operator[](par[x]));}
    int count(int x) { return cnt[operator[](x)];}
    int operator()(int x,int y) {
        if((x=operator[](x))==(y=operator[](y))) return x;
        cnt[y]=cnt[x]=cnt[x]+cnt[y];
        if(rank[x]>rank[y]) return par[x]=y;
        rank[x]+=rank[x]==rank[y]; return par[y]=x;
    }
};

int dp[2][2][5000][5000];
int w[5000];

int main() {
    int n, m;
    cin >> n >> m;
    FOR(i, n)
    {
        cin >> w[i];
    }
    int* pointer = &dp[0][0][0][0];
    FOR(i, 2 * 2 * 5000 * 5000)
    {
        pointer[i] = INT32_MIN;
    }
    dp[0][0][0][0] = 0;
    dp[0][1][0][0] = 0;
    dp[1][0][0][1] = 0;
    dp[1][1][0][1] = 0;
    int maxValue = INT32_MIN;
    FOR(u ,2)
    {
        FOR(i, n-1)
        {
            FOR(j,m + 1)
            {
                dp[u][0][i+1][j] = max(dp[u][0][i][j], dp[u][1][i][j]);
                //cout << "not used" << dp[u][0][i+1][j] << endl;
                if(j > 0)
                {
                    dp[u][1][i+1][j] = max(dp[u][0][i][j-1], dp[u][1][i][j-1] + w[i]);
                    //cout << "used" << dp[u][1][i+1][j] << endl;
                }
            }
        }
        maxValue = max(maxValue, dp[u][0][n-1][m]);
        if(u == 0)
        {
            maxValue = max(maxValue, dp[u][1][n-1][m]);
        }
        else if(u == 1)
        {
            maxValue = max(maxValue, dp[u][1][n-1][m] + w[n-1]);
        }
        //cout << "max " << maxValue << endl;
    }
    cout << maxValue << endl;
    return 0;
}