#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int n, a[10001];
  cin >> n;
  for (int i = 1; i <= n; ++i) cin >> a[i];
  if (n % 2 == 1 && a[1] % 2 == 1 && a[n] % 2 == 1)
    cout << "Yes";
  else
    cout << "No";
  return 0;
}
