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