#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
using namespace std;
map<string,int> M;
int main(){
    int N;
    cin>>N;
    for(int i=0;i<N;i++){
        string s;
        cin>>s;
        M[s]++;
    }
    for(auto m:M){
        if(m.second>(N+1)/2){
            cout<<"NO"<<endl;
            return 0;
        }
    }
    cout<<"YES"<<endl;
    return 0;
}