#include <bits/stdc++.h>
using namespace std;
const long long N = 100007;
long long n, x[N], y[N];
pair<long long, long long> mid(long long a, long long b) {
  long long xx = (x[a] + x[b]) / 2;
  long long yy = (y[a] + y[b]) / 2;
  return {xx, yy};
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cin >> n;
  for (long long i = 0; i < n; ++i) {
    cin >> x[i] >> y[i];
    x[i] *= 2;
    y[i] *= 2;
  }
  if (n % 2) {
    cout << "NO\n";
    return 0;
  }
  pair<long long, long long> midpoint = mid(0, n / 2);
  for (long long i = 1; i < n / 2; ++i) {
    pair<long long, long long> cur = mid(i, i + n / 2);
    if (cur != midpoint) {
      cout << "NO\n";
      return 0;
    }
  }
  cout << "YES\n";
  return 0;
}
