#include<bits/stdc++.h>
using namespace std;
int a[100005],zs=0,mod=100000,minn,maxx=INT_MIN;
int main()
{
	int n;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		if(a[i]>0) zs+=a[i];
	}
	sort(a+1,a+n+1);
	for(int i=1;i<=n;i++)
	{
		if(a[i]>0 && a[i]%2==1)
		{
			minn=a[i];
			break;
		} 
	}
	if(zs%2==1)
	{
		cout<<zs<<endl;
		return 0;
	} 
	else
	{
		for(int i=n;i>=0;i--)
		{
			if(a[i]<0) 
			{
				if(abs(minn)<abs(a[i]) && (a[i]+mod)%2==1)
				{
					if(maxx<zs+a[i]) maxx=a[i]+zs;
				} 
				else
				{
					if(maxx<zs-minn) maxx=zs-minn;
				} 
				
			} 
			
		}
	} 
	cout<<maxx<<endl;
	return 0;
}

91分，怎么错了？