#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for (int i = 0; i < n - 1; i++) {
    if (a[i] % 2 == 1) {
      a[i + 1]--;
      if (a[i + 1] < 0) {
        cout << "NO" << endl;
        return 0;
      }
    }
  }
  if (a[n - 1] % 2 == 0) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
