#include <iostream>
#include <vector>
#include <fstream>
#include <limits.h>
using namespace std;

int main(){
    ifstream in;
    ofstream out;
    in.open("ssm.in");
    out.open("ssm.out");
    vector<int> v;
    int n;
    in>>n;
    for(int i = 0; i<n;i++)
    {
        int x;
        in >> x;
        v.push_back(x);
    }
    vector<int> dp(n,0);
    int maxi = dp[0];
    dp[0]=v[0];
    for(int i = 1; i<n;i++){
        if(dp[i-1]<0)dp[i]=v[i];
        else dp[i]=dp[i-1]+v[i];
        if(dp[i]>maxi)maxi = dp[i];
    }
    out << dp[n-1];
    
}