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