#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[105];
  int n;
  while (~scanf("%d", &n)) {
    for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
    if (a[1] % 2 == 1 && a[n] % 2 == 1 && n % 2 == 1)
      printf("Yes\n");
    else
      printf("No\n");
  }
  return 0;
}
