#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  vector<string> V(N);
  for (int i = 0; i < N; i++) cin >> V.at(i);
  sort(V.begin(), V.end());
  V.push_back("");
  int ma = 0;
  for (int i = 0, j = 1; i < N; i++)
    j = (V.at(i) == V.at(i + 1)) ? ++j : 1, ma = max(ma, j);
  cout << ((ma <= (N + 1) / 2) ? "YES" : "NO") << "\n";
}