#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 5;
int sumo[maxn], sume[maxn];
int main() {
  int n;
  ios::sync_with_stdio(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    int t;
    cin >> t;
    if (i % 2)
      sumo[i] = sumo[i - 1] + t;
    else
      sumo[i] = sumo[i - 1];
    if (i % 2 == 0)
      sume[i] = sume[i - 1] + t;
    else
      sume[i] = sume[i - 1];
  }
  int ans = 0;
  for (int i = 1; i <= n; i++) {
    int cnto = sumo[i - 1] + (sume[n] - sume[i]);
    int cnte = sume[i - 1] + (sumo[n] - sumo[i]);
    if (cnto == cnte) {
      ans++;
    }
  }
  cout << ans << endl;
  return 0;
}
