#include <bits/stdc++.h>
using namespace std;
#define INF 1<<30
#define MAX 10005
#define FASTIO ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
typedef long long ll;


int main()
{
    FASTIO
    ///*
    //double start_time = clock();
#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    freopen("error.txt", "w", stderr);
#endif
    //*/

    int n;
    cin >> n;
    int mn = 100000000, mx = -100000000, sum = 0;
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        if(x > 0){
            sum += x;
            if(x%2 == 1 && x < mn){
                mn = x;// small positive odd integer.
            }
        }
        else if(x < 0){
            if(abs(x)%2 == 1 && x > mx){
                mx = x; //Big Negeative odd integer.
            }
        }
    }

    if(sum%2 == 0){
        sum = max(sum-mn, sum+mx);
    }
    cout << sum << endl;

    //double end_time = clock();
    //printf( "Time = %lf ms\n", ( (end_time - start_time) / CLOCKS_PER_SEC)*1000);

    return 0;
}