#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) {
    if (a[0] % 2 == 1 && a[n - 1] % 2 == 1)
      cout << "Yes" << endl;
    else
      cout << "No" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
