#include <iostream>
#include<vector>
#include<algorithm>
using namespace std;
using ll=long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin>>n;
    ll curr=0,ans=-1e18;
    for(int i=0;i<n;i++){
        ll a;
        cin>>a;
        curr=max(a,curr+a);
        ans=max(ans,curr);
    }
    cout<<ans;
    return 0;
}