#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
int a[n];
for(int i=0; i<n; i++)
{
cin>>a[i];
}
int sum=0;
int maxSum =0;
for(int i=0; i<n; i++)
{
sum+=a[i];
if(sum>maxSum)
{
maxSum = sum;
}
if(sum<0) sum =0;
}
cout<<maxSum<<endl;
}
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