#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  if (n % 2 != 0 && a[0] % 2 != 0 && a[n - 1] % 2 != 0) {
    cout << "YES";
  } else {
    cout << "NO";
  }
}
