#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

int N;
map<string, int> m;

void input() {
  string s;
  cin >> N;
  rep(i, 0, N) {
    cin >> s;
    m[s]++;
  }
}

void solve() {
  string ans = "YES";
  int chk = (N + ((N & 1) ? 1 : 0)) / 2;
  for (auto e : m)
    if (e.second > chk) ans = "NO";
  cout << ans << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  input();
  solve();
}