#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define SZ(x) ((int)(x).size())
#define all(x) x.begin(), x.end()
#define debug(x) cout << #x << ": " << x << " "
#define nl cout << "\n"
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define per(i, a, b) for(int i = (a); i >= (b); i--)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MAXN = 3e5+100;
int N, K, a[MAXN];
ll dp[MAXN];
void solve(){
cin >> N >> K;
rep(i, 1, N + 1){
cin >> a[i];
}
rep(k, 1, K + 1){
ll s = 0, mx = 0;
rep(i, 1, N + 1){
s += a[i];
s = max(s, dp[i]);
mx = max(mx, s);
dp[i] = mx;
}
}
cout << dp[N];
}
int main(){
ios_base::sync_with_stdio(false), cin.tie(nullptr);
solve();
return 0;
}
