#include <bits/stdc++.h>

using namespace std;

#define int long long
#define ll long long
#define forn(i, n) for (ll i = 0; i < n; ++i)
#define forr(i, s, n) for (ll i = s; i < n; ++i)
#define fori(i, s, n) for (ll i = s; i > n; --i)
#define fora(i, n) for (auto i: n)
#define vi vector<int>
#define vll vector<ll>

const int MOD = 998244353;
// const int MOD = 1e9 + 7;

void solve() {
    int n;
    cin >> n;
    vi vec(n);
    forn(i, n) cin >> vec[i];
    int b = vec[0];
    int c = 0;
    for (int i = 1; i < n; i++) {
        c += vec[i];
        if (c >= b) b = c, c = 0;
    }
    cout << b << endl;
}

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int t = 1;
    // cin >> t;
    while (t--) solve();

    return 0;
}