#include <bits/stdc++.h>
using namespace std;
int n, a, cnt;
int main() {
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a;
    if ((i == 0 || i == n - 1) && a % 2 == 0) {
      cnt++;
    }
  }
  if (n % 2 == 0 || cnt > 0)
    cout << "No";
  else
    cout << "Yes";
  return 0;
}
