/*   /\_/\
    (= ._.)
    / >0  \>1
*/
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll n, a[100001], dp[100001], cnt[100002], l[100001], r[100001], kq=0;
int main()  
{

  ios::sync_with_stdio(false);
  cin.tie(0);
  
  cin >> n;
  dp[0] = 0;
  cnt[n + 1] = 0;
  for (ll i = 1; i <= n; ++i)
  {
    cin >> a[i];
    dp[i] = dp[i - 1] + a[i];
  }
  l[1] = a[1], r[n] = a[n];
  l[0] = 0;
  for (ll i = n; i >= 1; --i)
  {
    cnt[i] = cnt[i + 1] + a[i];
  }
  for (ll i = 2; i <= n; ++i)
  {
    l[i] = min(l[i - 1], dp[i]);
  }
  for (ll i = n - 1; i >= 1; --i)
  {
    r[i] = min(r[i + 1] + a[i], a[i]);
  }
  for (ll i = 1; i <= n; ++i)
  {
    if (r[i] > 0 and cnt[i] + l[i - 1] > 0) kq++; 
  }
  cout << kq;
  return 0;
}