#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];
  sort(a, a + n);
  int count = 1;
  for (int i = 1; i < n; i++) {
    if (a[i] == a[i - 1]) {
      count++;
      if (n % 2 == 0) {
        if (count > n / 2) {
          cout << "NO";
          exit(0);
        }
      } else {
        if (count > (n / 2) + 1) {
          cout << "NO";
          exit(0);
        }
      }
    } else
      count = 1;
  }
  cout << "YES";
}
