#include <bits/stdc++.h>
using namespace std;
int a[200], n;
int main() {
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
  if (n & 1 && a[1] & 1 && a[n] & 1)
    printf("Yes");
  else
    printf("No");
  return 0;
}
