#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1000 + 10;
int n;
int a[MAXN];
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  if (a[1] & 1 && a[n] & 1 && n & 1) {
    cout << "Yes";
  } else {
    cout << "No";
  }
  return 0;
}
