#include <bits/stdc++.h>
using namespace std;
int a[200002], even[200002], odd[200002];
int main() {
  int n;
  cin >> n;
  cin >> a[1];
  for (int i = 2; i <= n; i++) {
    cin >> a[i];
    if (i & 1) {
      even[i] = even[i - 1] + a[i - 1];
      odd[i] = odd[i - 1];
    } else {
      even[i] = even[i - 1];
      odd[i] = odd[i - 1] + a[i - 1];
    }
  }
  if ((n + 1) & 1) {
    even[n + 1] = even[n] + a[n];
    odd[n + 1] = odd[n];
  } else {
    even[n + 1] = even[n];
    odd[n + 1] = odd[n] + a[n];
  }
  int ans = 0;
  for (int i = 1; i <= n; i++) {
    int x, y;
    if (i & 1) {
      x = odd[i] + even[n + 1] - even[i];
      y = even[i] + odd[n + 1] - odd[i + 1];
    } else {
      x = odd[i] + even[n + 1] - even[i + 1];
      y = even[i] + odd[n + 1] - odd[i];
    }
    if (x == y) ans++;
  }
  cout << ans;
  return 0;
}
