#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, sum = 0, a, maxx = 0;
  scanf("%I64d", &n);
  for (long long i = 0; i < n; ++i) {
    scanf("%I64d", &a);
    sum += a;
    maxx = max(maxx, a);
  }
  if (sum - maxx >= maxx) {
    if (sum % 2)
      printf("NO\n");
    else
      printf("YES\n");
  } else
    printf("NO\n");
}
