#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long n;
  cin >> n;
  long long cnt[1001] = {};
  for (long long i = 0; i < n; ++i) {
    long long x;
    cin >> x;
    cnt[x]++;
    if (cnt[x] > (n + 1) / 2) {
      cout << "NO";
      return 0;
    }
  }
  cout << "YES";
  return 0;
}
