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