10
-3 4 -4 1 1 -4 -5 3 -4 -2
 10
8 9 -10 -10 -4 -3 5 9 -9 9
 6
5 -4 2 -1 2 -2
 11
3 0 1 -2 5 -5 -1 0 3 2 2
 10
4 -2 -2 -2 2 0 1 0 -4 -1
 4
2 2 -3 4
 11
-11 -7 -2 -24 30 -26 24 9 -8 -9 23
 6
30 -29 5 5 -29 30
 24
-8 -6 6 -11 -15 -7 10 -19 -6 21 14 -4 -21 -10 12 17 1 -1 5 19 2 0 -4 -23
 10
-9 -6 -1 9 -2 0 0 -1 5 0
 6
10 -8 3 3 -8 10
 10
-2 -3 -1 4 -3 2 0 1 -5 4
 5
30 -29 10 -1 10
 31
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -29 30
 7
30 -20 5 1 3 -20 30
 5
30 -29 4 -3 4
 10
-5 28 -18 -10 9 -2 11 -6 -19 30
 8
4 -10 13 -13 2 2 -11 6
 131
30 -29 29 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 28 -28 27 -26 27
 10
-4 4 0 -2 3 0 1 2 3 -4
 10
-2 -8 5 4 -1 -6 -9 6 1 -6
 7
25 -17 13 13 -25 25 -24
 10
3 -3 2 1 -4 -2 3 -2 -3 0
 10
4 -5 0 4 0 0 -3 1 1 -4
 10
0 4 4 1 -3 4 2 1 4 -1
 17
15 -13 7 8 8 1 -19 12 8 -23 -4 16 -13 -28 10 -30 -14
 4
1 1 -4 10
 11
3 -2 1 1 1 1 1 1 1 -3 4
 7
30 -29 10 10 10 -29 30
 7
25 -13 17 -23 12 12 9
 7
15 -14 10 10 10 -14 15
 10
3 0 0 -4 3 1 -2 -1 -1 4
 6
8 -7 7 -6 5 5
 10
1 -4 -4 4 -2 -3 3 0 -2 3
 15
1 -26 -6 26 7 10 -2 -4 -6 14 -9 25 9 -12 -28
 6
30 -29 10 10 -29 30
 1
6
 2
1 1
 5
0 5 -4 3 -1
 7
5 -4 3 -1 3 -4 4
 10
16 -15 13 -1 10 -2 -20 26 5 -30
 10
-1 2 0 -1 2 -1 4 3 -5 1
 7
5 -4 1 1 1 -4 5
 5
10 -3 -5 3 5
 10
4 -4 3 -2 3 -4 -2 0 1 0
 10
-5 -5 -3 1 -2 2 0 2 -3 4
 10
2 -4 -2 3 1 1 -2 -1 -3 4
 10
-4 -5 4 -3 2 -2 2 1 -1 0
 10
0 -1 4 -2 3 -2 -1 -5 -5 2
 5
19 -6 1 -11 19
 10
1 0 -4 3 -5 3 -1 2 2 -5
 7
5 -5 3 4 3 -5 5
 10
-5 2 -3 -3 -4 3 3 0 2 4
 4
2 3 -10 11
 10
27 -17 15 -22 18 17 -6 2 16 -14
 6
30 -22 6 7 -22 30
 7
30 -25 0 6 9 -2 10
 9
7 2 -1 1 1 -10 6 -1 6
 4
1 -10 1 10
 5
17 -16 12 -11 15
 35
-23 -22 23 4 -22 29 -4 -6 -28 18 -5 21 -7 -8 -11 -7 30 -25 -1 12 19 5 -8 12 -1 10 -24 -19 24 -17 -7 24 20 -22 16
 10
4 -3 1 -2 1 1 0 -4 4 -2
 10
4 -2 1 0 1 -5 -2 1 0 -5
 2
3 9
 9
11 -5 -5 1 2 3 -5 -5 11

1
 8
 1
 4
 1
 2
 15
 5
 36
 2
 3
 1
 9
 28
 4
 1
 7
 2
 1
 7
 4
 13
 1
 1
 13
 16
 1
 6
 20
 21
 20
 1
 5
 1
 44
 10
 0
 1
 0
 2
 9
 5
 2
 3
 1
 2
 2
 1
 1
 3
 3
 6
 8
 2
 29
 6
 13
 5
 1
 1
 30
 1
 1
 3
 3

#include <bits/stdc++.h>
using namespace std;
template <typename T, typename U>
static inline void amin(T &x, U y) {
  if (y < x) x = y;
}
template <typename T, typename U>
static inline void amax(T &x, U y) {
  if (y > x) x = y;
}
const long long int mod = 998244353;
const long long inf = (long long int)1e18 + 17;
const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};
long long int tree[500010], a[100010], pre[100010], tree1[500010];
void build(int node, int start, int end) {
  if (start == end) {
    tree[node] = pre[start];
  } else {
    int mid = (start + end) / 2;
    build(2 * node, start, mid);
    build(2 * node + 1, mid + 1, end);
    tree[node] = min(tree[2 * node], tree[2 * node + 1]);
  }
}
void update(int node, int start, int end, int idx, int val) {
  if (start == end) {
    a[idx] += val;
    tree[node] += val;
  } else {
    int mid = (start + end) / 2;
    if (start <= idx and idx <= mid) {
      update(2 * node, start, mid, idx, val);
    } else {
      update(2 * node + 1, mid + 1, end, idx, val);
    }
    tree[node] = max(tree[2 * node], tree[2 * node + 1]);
  }
}
int query(int node, int start, int end, int l, int r) {
  if (r < start or end < l) {
    return 10000000;
  }
  if (l <= start and end <= r) {
    return tree[node];
  }
  int mid = (start + end) / 2;
  int p1 = query(2 * node, start, mid, l, r);
  int p2 = query(2 * node + 1, mid + 1, end, l, r);
  return min(p1, p2);
}
void mbuild(int node, int start, int end) {
  if (start == end) {
    tree1[node] = pre[start];
  } else {
    int mid = (start + end) / 2;
    mbuild(2 * node, start, mid);
    mbuild(2 * node + 1, mid + 1, end);
    tree1[node] = max(tree1[2 * node], tree1[2 * node + 1]);
  }
}
int mquery(int node, int start, int end, int l, int r) {
  if (r < start or end < l) {
    return -10000000;
  }
  if (l <= start and end <= r) {
    return tree1[node];
  }
  int mid = (start + end) / 2;
  int p1 = mquery(2 * node, start, mid, l, r);
  int p2 = mquery(2 * node + 1, mid + 1, end, l, r);
  return max(p1, p2);
}
long long int lef[100010], rgt[100010];
void lefsmall(long long int *arr, int n) {
  stack<pair<int, int>> S;
  int ind = 0;
  for (int i = 0; i < n; i++) {
    while (!S.empty() && S.top().first <= arr[i]) S.pop();
    if (S.empty())
      lef[ind++] = 0;
    else
      lef[ind++] = S.top().second + 1;
    S.push({arr[i], i});
  }
}
void rgtsmall(long long int *arr, int n) {
  stack<pair<int, int>> S;
  int ind = n - 1;
  for (int i = n - 1; i >= 0; i--) {
    while (!S.empty() && S.top().first <= arr[i]) S.pop();
    if (S.empty())
      rgt[ind--] = n - 1;
    else
      rgt[ind--] = S.top().second - 1;
    S.push({arr[i], i});
  }
}
void solve() {
  long long int n;
  cin >> n;
  long long int b[n + 10];
  pre[0] = 0;
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 1; i <= n; i++) pre[i] = pre[i - 1] + a[i - 1];
  build(1, 0, n);
  mbuild(1, 0, n);
  lefsmall(a, n);
  rgtsmall(a, n);
  long long int ans = -1;
  for (int i = 0; i < n; i++) {
    int aa, b, val1 = pre[i], val2 = pre[i + 1];
    aa = lef[i];
    b = i - 1;
    aa++;
    b++;
    if (b >= aa) {
      amin(val1, query(1, 0, n, aa - 1, b - 1));
    }
    aa = i + 1;
    b = rgt[i];
    aa++;
    b++;
    if (b >= aa) {
      amax(val2, mquery(1, 0, n, aa, b));
    }
    amax(ans, val2 - val1 - a[i]);
  }
  cout << ans << endl;
}
int main() {
  clock_t tt;
  tt = clock();
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
  for (int i = 1; i <= t; i++) {
    solve();
  }
  tt = clock() - tt;
  double time_taken = ((double)tt) / CLOCKS_PER_SEC;
  return 0;
}
