#include <bits/stdc++.h>
typedef long long ll;
#define INF 1000000000
#define MOD 1000000007
using namespace std;
int main(void){
    int n;
    cin>>n;
    map<string,int>mp;
    for(int i=0;i<n;i++){
        string s;
        cin>>s;
        mp[s]++;
    }
    vector<pair<int,string>>v;
    for(auto it= mp.begin(); it != mp.end(); ++it) {
        v.push_back({it->second,it->first});
    }
    sort(v.begin(),v.end());
    int num=v[v.size()-1].first;
    if(num<(n+1)/2){
        cout<<"YES"<<endl;
    }else{
        cout<<"NO"<<endl;
    }
}