#include <bits/stdc++.h>
using namespace std;
int n, a[101];
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) cin >> a[i];
  if (n % 2 == 0 || a[1] % 2 == 0 || a[n] % 2 == 0)
    cout << "No";
  else
    cout << "Yes";
  return 0;
}
