#include <bits/stdc++.h>
#define x first
#define y second
#define pb push_back
using namespace std;
typedef long long ll;
const int N = 100005;
int n, pre[N], cnt = 0, ans = 2e9;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  pre[0] = 0;
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    cnt += x;
    pre[i] = pre[i - 1] + x;
  }
  for (int i = 1; i <= (n - cnt + 1); i++) {
    ans = min(ans, cnt - pre[i + cnt - 1] + pre[i - 1]);
  }
  cout << ans << '\n';
  return 0;
}