#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << a << endl;}
template<class T> void writes(vector<T> a, char* c = " "){cout << a[0];for(int i = 1; i < a.size(); i++)cout << c << a[i];cout << endl;;}
void write(double a){cout << fixed << setprecision(12) << a << endl;}
template<class T> void warr(T a, int n, char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

int n,m,w[4000];
int dp[3010][3010][2][2]={0};
const int MA=10000*10000;

int solve(int i,int gc,bool g,const bool& fg){
    if(i>=n||gc==m){
        if(i>=n&&gc==m)return (g&&fg)?w[n-1]:0;
        else if(gc==m)return 0;
        else return -MA;
    }
    if(m-gc>n-i)return -MA;
    if(dp[i][gc][g][fg]<MA)
        return dp[i][gc][g][fg];
    int res;
    if(gc>=m){
        res=solve(i+1,gc,false,fg);
    }
    else{
        res=solve(i+1,gc,false,fg);
        res=max(res,solve(i+1,gc+1,true,fg)+w[i-1]*g);
    }
    return dp[i][gc][g][fg]=res;
}

int main(void)
{
    cin>>n>>m;
    rep(i,n)rep(j,n)rep(k,2)dp[i][j][k][0]=dp[i][j][k][1]=MA;
    rep(i,n)read(w[i]);
    int res=solve(1,0,false,false);
    res=max(res,solve(1,1,true,true));
    write(res);
	return 0;
}