#include<iostream>
#include<fstream>
using namespace std;

#define IN "ssm.in"
#define OUT "ssm.out"
#define LUNG 86000

int main()
{
long long int i,sum[LUNG],n,bestSum,min,a[LUNG],N,best[LUNG];

ifstream f(IN);
ofstream g(OUT);

f>>N;
for(i=1; i<=N; i++)
    f>>a[i];

sum[0] = 0;
for (i = 1; i <= N; i++)
    {
     sum[i] = a[i] + sum[i-1];
     }
min = sum[0];

bestSum = -100000;

for (i = 1; i <= N; i++)
   {
    best[i] = sum[i] - min;
    if (min > sum[i])
        min = sum[i];
    if (bestSum < best[i])
        bestSum = best[i];
   }

g<<bestSum;

return 0;
}