#include<iostream>
#include<string>
#include<vector>
#include<queue>
#include<stack>
#include<map>
#include<set>
#include<algorithm>
#include<functional>
#include<cstdio>
#include<cstdlib>
#include<cmath>
using namespace std;

#define mind(a,b) (a>b?b:a)
#define maxd(a,b) (a>b?a:b)
#define absd(x) (x<0?-(x):x)
#define pow2(x) ((x)*(x))
#define rep(i,n) for(int i=0; i<n; ++i)
#define repr(i,n) for(int i=n-1; i>=0; --i)
#define repl(i,s,n) for(int i=s; i<=n; ++i)
#define replr(i,s,n) for(int i=n; i>=s; --i)
#define repf(i,s,n,j) for(int i=s; i<=n; i+=j)
#define repe(e,obj) for(auto e : obj)

#define SP << " " <<
#define COL << " : " <<
#define COM << ", " <<
#define ARR << " -> " <<
#define PNT(STR) cout << STR << endl
#define POS(X,Y) "(" << X << ", " << Y << ")"
#define DEB(A) " (" << #A << ") " << A
#define DEBREP(i,n,val) for(int i=0; i<n; ++i) cout << val << " "; cout << endl
#define ALL(V) (V).begin(), (V).end()
#define INF 1000000007
#define INFLL 10000000000000000007LL
#define EPS 1e-9

typedef unsigned int uint;
typedef unsigned long ulong;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> P;
//typedef pair<ll, ll> P;
typedef pair<P, int> PI;
typedef pair<int, P> IP;
typedef pair<P, P> PP;
typedef priority_queue<P, vector<P>, greater<P> > pvqueue;

#define N 3003
int n, m;
int w[N];
int dp[N], rs[N];
bool used[N][N];
int base;

int main() {
  cin >> n >> m;
  if(m<2) {
      cout << 0 << endl;
      return 0;
  }
  rep(i, n) cin >> w[i];
  int ans = -INF;
  // 1
  rep(i, m+1) dp[i] = rs[i] = -INF;
  dp[1] = 0;
  repl(i, 1, n-1) {
    int dp2[N];
    int base = (i==n-1 ? w[n-1] : 0);
    dp2[0] = -INF;
    rep(j, m) {
        dp2[j+1] = maxd(-INF, dp[j]+w[i-1]+base);
        dp2[j+1] = maxd(dp2[j+1], rs[j]+base);
    }
    rep(j, m+1) rs[j] = maxd(dp[j], rs[j]);
    rep(j, m+1) dp[j] = dp2[j];
    ans = maxd(ans, dp[m]);
  }
  // 0
  rep(i, m+1) dp[i] = rs[i] = -INF;
  rs[0] = 0;
  repl(i, 1, n-1) {
    int dp2[N];
    dp2[0] = -INF;
    rep(j, m) {
      dp2[j+1] = maxd(-INF, dp[j]+w[i-1]);
      dp2[j+1] = maxd(dp2[j+1], rs[j]);
    }
    rep(j, m+1) rs[j] = maxd(dp[j], rs[j]);
    rep(j, m+1) dp[j] = dp2[j];
    ans = maxd(ans, dp[m]);
  }
  cout << ans << endl;
  return 0;
}