#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, ma;
map<string, int> mp;

int main() {
  cin >> N;
  for (int i = 0; i < N; i++) {
    string A; cin >> A;
    mp[A]++;
  }
  if (N % 2 == 1) {
    ma = N / 2 + 1;
  } else {
    ma = N / 2;
  }
  for (auto p: mp) {
    if (p.second > ma) {
      cout << "NO" << endl;
      return 0;
    }
  }
  cout << "YES" << endl;
  return 0;
}