#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)
void flagfunc4(bool flag){cout<<(flag?"YES\n":"NO\n");}

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n;cin>>n;
  map<string,int>m;
  string a;
  rep(i,n){
    cin>>a;
    m[a]++;
  }
  int k=0;
  for(auto itr=m.begin();itr!=m.end();++itr){
    if(k<itr->second)k=itr->second;
  }
  flagfunc4(2*(k-1)<n);
}