#include <bits/stdc++.h> using namespace std; int a[1000], sum = 0; int main(){ int n, max = INT_MIN; cin >> n; for(int i = 1; i <= n; i++){ cin >> a[i]; } for(int i = 1; i <= n; i++){ if(a[i] > 0){ sum += a[i]; } if(sum > max){ max = sum; } } cout << max / 2; return 0; }