#include <bits/stdc++.h>
using namespace std;
const int MAXN = 130;
int a[MAXN];
int main() {
  int N;
  cin >> N;
  for (int i = 1; i < (N + 1); ++i) cin >> a[i];
  bool ok = 0;
  if ((a[N] & 1) == 0 || (a[1] & 1) == 0)
    ok = 0;
  else if (N & 1)
    ok = 1;
  if (ok)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
