#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
using namespace std;

int main(){
    int n; cin >> n;
    int mx=0;
    map<string,int> m;
    rep(i,0,n){
        string s; cin >> s;
        m[s]++;
        mx = max(mx,m[s]);
    }
    if((n+1)/2 >= mx){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
}