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#include <iostream>
using namespace std;
int a[101];
int main() {
int n;
cin >> n;
for (int i = 0; i < n; i++) cin >> a[i];
int s = a[0] + a[1] + a[2];
for (int i = 1; i < n - 2; i++) s = max(s, a[i] + a[i + 1] + a[i + 2]);
cout << s << endl;
return 0;
}