#include <bits/stdc++.h>
using namespace std;

signed main(){
  int N; cin >> N;
  map< string, int > freq;
  int maxf = 0;
  for( int i = 0; i < N; ++i ){
    string s; cin >> s;
    maxf = max( maxf, ++freq[ s ] );
  }
  int bound = ( N & 1 ) ? N / 2 + 1 : N / 2;
  if( maxf <= bound )
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}