#include <bits/stdc++.h>
using namespace std;
int x, y;
vector<int> v;
int main() {
  cin >> x;
  for (int i = 0; i < x; i++) {
    cin >> y;
    v.push_back(y);
  }
  int n = v.size();
  if (x % 2 == 0 || v[0] % 2 == 0 || v[n - 1] % 2 == 0) {
    cout << "No";
  } else {
    cout << "Yes";
  }
  return 0;
}
