#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
long long fac(long long n) {
  if (n == 1) return 1;
  return n * fac(n - 1);
}
long long power(long long x, long long y) {
  long long res = 1;
  for (long long i = 1; i <= y; i++) res = (res * x) % 1000000007;
  return res % 1000000007;
}
int32_t main() {
  long long T = 1;
  while (T--) {
    long long n;
    cin >> n;
    long long a[n];
    long long e = 0, o = 0;
    for (long long i = 0; i < n; i++) {
      cin >> a[i];
      if (i % 2 == 0)
        e += a[i];
      else
        o += a[i];
    }
    long long ans = 0;
    for (long long i = 0; i < n; i++) {
      if (i % 2 == 0) {
        if (e - a[i] == o) ans++;
        e -= a[i];
        o += a[i];
      } else {
        if (o - a[i] == e) ans++;
        e += a[i];
        o -= a[i];
      }
    }
    cout << ans << endl;
  }
  return 0;
}
