#include <bits/stdc++.h>
using namespace std;
long long n, a[110];
signed main() {
  ios_base ::sync_with_stdio(0);
  cin >> n;
  for (long long i = 0; i < n; i++) cin >> a[i];
  if (n & 1) {
    if ((a[0] & 1) && (a[n - 1] & 1))
      cout << "Yes" << '\n';
    else
      cout << "No" << '\n';
  } else {
    cout << "No" << '\n';
  }
  return 0;
}
