#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
clock_t start = clock();
int gcd(int a, int b) { return (a == 0) ? b : gcd(b % a, a); }
int power(int a, int n) {
  int p = 1;
  while (n > 0) {
    if (n % 2) {
      p = p * a;
    }
    n >>= 1;
    a *= a;
  }
  return p;
}
int powm(int a, int n, int mod_) {
  int p = 1;
  while (n) {
    if (n % 2) {
      p = (((p % mod_) * 1LL * (a % mod_)) % mod_);
    }
    n >>= 1;
    a = (((a % mod_) * 1LL * (a % mod_)) % mod_);
  }
  return p % mod_;
}
int powi(int a, int mod_) { return powm(a, mod_ - 2, mod_); }
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int mn, mx;
  int n, m, k, t, i, j, sum = 0, flag = 0, cnt = 0;
  int x = 0, y = 0, z, l, r, q;
  int TC = 1;
  while (TC--) {
    cin >> n;
    vector<int> a(n);
    for (i = 0; i < n; ++i) cin >> a[i];
    sort((a).begin(), (a).end());
    reverse((a).begin(), (a).end());
    i = n - 1;
    x = -1000000007;
    while (i >= 0 and a[i] <= 0) {
      if (a.back() % 2) x = a.back();
      a.pop_back();
      --i;
    }
    reverse((a).begin(), (a).end());
    n = (int)((a).size());
    sum = accumulate((a).begin(), (a).end(), 0);
    ;
    y = 1000000007;
    i = 0;
    while (i < n) {
      if (a[i] % 2) {
        y = a[i];
        break;
      }
      ++i;
    }
    if (sum % 2)
      cout << sum;
    else {
      cout << max(sum - y, sum + x);
    }
  };
  return 0;
}
