#include<bits/stdc++.h>
using namespace std;
const int MAXN=1000001;

//https://blog.csdn.net/weixin_40295575/article/details/79627575
//program received signal sigsegv，需要注意的问题
// 确实是栈溢出，大数组定义的时候尽量不要定义在函数体内

int a[MAXN];
int main() {
	int n,i;
	int ans;
	int t;
	cin>>n;
	for(i=1; i<=n; i++)
		cin>>a[i];
	ans=a[1];
	t=ans;

	for(i=2; i<=n; i++) {
		if(t>=0) {
			cout<<"t>=0	 before	"<<"i="<<i<<"	"<<"t="<<t<<"	"<<"ans="<<ans<<endl;
			t=t+a[i];
			cout<<"t>=0	 end	"<<"i="<<i<<"	"<<"t="<<t<<"	"<<"ans="<<ans<<endl;
		} else {
			cout<<"t<0	 before	"<<"i="<<i<<"	"<<"t="<<t<<"	"<<"ans="<<ans<<endl;
			t=a[i];
			cout<<"t<0	 end	"<<"i="<<i<<"	"<<"t="<<t<<"	"<<"ans="<<ans<<endl;
		}
		cout<<endl;
		if(t>ans) ans=t;
	}
	cout<<ans;
	return 0;
}