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

int main(){
   int elsenum,maxnum = 0,n;
   cin >> n;
   map<string,int> m;
   for(int i = 0;i < n;i++){
      string s;
      cin >> s;
      m[s]++;
      maxnum = max(maxnum,m[s]);
   }
   for(auto itr = m.begin();itr != m.end();itr++){
      elsenum = 0;
      for(auto itr2 = m.begin();itr2 != m.end();itr2++){
         if(itr == itr2) continue;
         else elsenum += itr2->second;
      }
      if(maxnum - 1 > elsenum){
         cout << "NO" << endl;
         return 0;
      }
   }
   cout << "YES" << endl;
}