#include <iostream>
#include <map>
using namespace std;
int main(){
    int n;cin>>n;
    map<string,int> A;
    for(int i = 0; n > i; i++){
        string s;cin>>s;
        A[s]++;
    }
    for(auto x:A){
        if(x.second >= (n+3)/2){
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
}

//3 3 6
//4 3 7
//5 4 8
//6 4 9