#include <bits/stdc++.h>
using namespace std;
int a[110];
int main() {
  int n;
  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\n");
  else
    printf("No\n");
  return 0;
}
