#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;
const int dx[] = {0, 1, 0, -1};
const int dy[] = {-1, 0, 1, 0};
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (auto& v : a) {
    cin >> v;
  }
  vector<int> memo = a;
  for (int i = 0; i < n - 1; i++) {
    memo[i + 1] += memo[i];
  }
  vector<int> memo2 = a;
  for (int i = n - 1; i > 0; i--) {
    memo2[i - 1] += memo2[i];
  }
  int ans = 0;
  map<int, int> mp;
  for (auto& v : memo) {
    if (mp.count(v) != 0) {
      ans++;
      continue;
    }
    if (v >= 0) {
      mp[v]++;
    }
  }
  if (memo[0] == memo[n - 1]) {
    ans++;
  }
  map<int, int> mp2;
  for (auto& v : memo2) {
    if (mp2.count(v) != 0) {
      ans++;
      continue;
    }
    if (v >= 0) {
      mp2[v]++;
    }
  }
  if (memo2[0] == memo2[n - 1]) {
    ans++;
  }
  cout << ans << endl;
  return 0;
}
