#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)

void YESorNO(bool p) {
  cout << (p ? "YES" : "NO") << endl;
  return;
}

int main() {
  map<string, int> g;
  int n;
  cin >> n;
  rep(i,n) {
    string a;
    cin >> a;
    g[a]++;
  }
  bool flag = true;
  for (auto p : g) {
    if (p.second > (n + 1) / 2) flag = false;
  }
  YESorNO(flag);
  return 0;
}