#include <iostream>
#include <map>
using namespace std;
int main(void){
    // Here your code !
    map<string,int> m;
    int n;
    cin >> n;
    for(int i=0;i<n;i++){
        string x;
        cin >>x ;
        m[x]++;
    }
    int max=0;
    int sum=0;
    for (auto i = m.begin(); i != m.end(); ++i) {
        sum+=i->second;
        if(i->second>max)max=i->second;
    }
    if(sum>=2*max-1)cout<<"YES"<<endl;
    else cout<<"NO"<<endl;
    return 0;
    
}