#include <bits/stdc++.h>
int a[200];
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
  if (n % 2 == 1 && a[1] % 2 == 1 && a[n] % 2 == 1)
    printf("Yes\n");
  else
    printf("No\n");
}
