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