#include <bits/stdc++.h>

using namespace std;


int main() {
  int n;
  cin >> n;
  map<string, int> m;
  int ma = -1;
  for (int i = 0; i < n; ++i) {
    string a;
    cin >> a;
    m[a]++;
    ma = max(ma, m[a]);
  }
  if (ma <= ceil((double)n / 2) ) puts("YES");
  else puts("NO");
  return 0;
}