#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  map<string,int> m;
  for(int i=0;i<N;i++){
      string s;
      cin>>s;
      m[s]++;
  }
  for(auto x:m){
      if((N-1)/2+1 < x.second){
          cout<<"NO"<<endl;
          return 0;
      }
  }
  cout<<"YES"<<endl;
}