#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  int N; cin >> N;
  map<string, int> mp;
  for(int i = 0; i < N; i++){
    string S; cin >> S;
    mp[S]++;
  }
  if(N%2 != 0) N++;
  int maxs = 0;
  for(auto p: mp){
    maxs = max(maxs, p.second);
  }
  if(maxs <= N/2) cout << "YES" << endl;
  else cout << "NO" << endl;
}