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