#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int N[maxn];
int main() {
  int n;
  scanf("%d", &n);
  if (n & 1) {
    for (int i = 1; i <= n; i++) scanf("%d", &N[i]);
    if (N[1] % 2 == 0 || N[n] % 2 == 0)
      puts("No");
    else
      puts("Yes");
  } else
    puts("No");
  return 0;
}
