#include <bits/stdc++.h>
using namespace std;

int main() {
  int N; cin >> N;
  bool ok = true;
  vector<int> A(N); for (int &B : A) cin >> B;
  for (int i = 0; i < N; i++)
    if (A.at(0) + A.at(N - 1) != A.at(i) + A.at(N - i - 1))
      ok = false;
  cout << (ok ? "Yes" : "No") << endl;
}