include<bits/stdc++.h>

using namespace std;

int tongcon(int A[], int x, int y) {
int t = 0;
for (int i = x; i <= y; i++) {
t += A[i];
}
return t;
}

int main() {
int N;
cin >> N;
int X[N];
for (int i = 1; i <= N; i++) {
cin >> X[i];
}
int d, c;
int max = 0;
for (int i = 1; i <= N; i++) {
d = i;
for (int j = i + 1; j <= N; j++) {
if (X[j] == X[i]) {
c = j;
}
if (tongcon(X, d, c) > max) {
max = tongcon(X, d, c);
}
}
}
cout << max;
return 0;
}