#include <iostream>
#include <map>
using namespace std;

int main(){
   int n;
   cin >> n;
   map<string,int> m;
   for(int i = 0;i < n;i++){
      string s;
      cin >> s;
      m[s]++;
   }
   if(m.size() == 2){
      cout << "YES" << endl;
      return 0;
   }
   for(auto itr = m.begin();itr != m.end();itr++){
      if(itr->second > (n + 1) / 2){
         cout << "NO" << endl;
         return 0;
      }
   }
   cout << "YES" << endl;
}