#include <bits/stdc++.h>
using namespace std;
const long long M = 1e9 + 7;
const double pi = 3.141592653589793238463;
long long modExp(long long x, long long n, long long M) {
  long long result = 1;
  while (n > 0) {
    if (n % 2 == 1) result = (result * x) % M;
    x = (x * x) % M;
    n = n / 2;
  }
  return result;
}
long long fast_exp(long long x, long long n) {
  long long ans = 1;
  while (n) {
    if (n & 1) ans *= x;
    n = n >> 1;
    x = x * x;
  }
  return ans;
}
bool sortbysec(const pair<long long, long long> &a,
               const pair<long long, long long> &b) {
  return (a.second < b.second);
}
bool vow(char ch) {
  return ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u';
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long long n;
  cin >> n;
  long long a[n];
  for (long long i = 0; i < n; i++) {
    cin >> a[i];
    a[i] = a[i] % 2;
  }
  stack<long long> s;
  for (long long i = 0; i < n; i++) {
    if (s.size() and s.top() == a[i])
      s.pop();
    else
      s.push(a[i]);
  }
  if (s.size() <= 1)
    cout << "YES";
  else
    cout << "NO";
}
