#include <bits/stdc++.h>
using namespace std;
int n;
const int N = 100;
int ara[N + 5];
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) cin >> ara[i];
  if (n % 2 == 1 and ara[1] % 2 == 1 and ara[n] % 2 == 1) {
    cout << "Yes\n";
  } else {
    cout << "No\n";
  }
}
