#include <bits/stdc++.h>
int a[13245];
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
  if (a[1] % 2 && a[n] % 2) {
    if (n % 2 == 1)
      printf("Yes\n");
    else
      printf("No\n");
  } else
    printf("No\n");
  return 0;
}
