#include <bits/stdc++.h>
using namespace std;
long long a[110];
long long n;
signed main() {
  scanf("%d", &n);
  for (long long i = 1; i <= n; i++) scanf("%d", &a[i]);
  if (n % 2 == 0 || a[1] % 2 == 0 || a[n] % 2 == 0) {
    cout << "No";
    return 0;
  }
  cout << "Yes";
  return 0;
}
