#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  if ((a[0] % 2 == 1) && (n % 2 == 1) && (a[n - 1] % 2 == 1)) {
    printf("YES");
  } else {
    printf("NO");
  }
}
