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