#include <bits/stdc++.h> using namespace std; using ll = long long; #define vi vector<long long> #define all(x) x.begin(), x.end() #define endl "\n" void solution(); int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); solution(); return 0; } const int N = 3e5+10; ll a[N]; void solution() { ll n, k; cin >> n >> k; for (int i = 1; i <= n; i++) cin >> a[i]; ll best = 0; ll sum = 0; for (int i = 1; i <= n; i++) { sum += a[i]; if (sum < 0) sum = 0; best = max(best, sum); } cout << best << endl; }