#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main(){
    int n,max = 0,cnt = 1;
    cin >> n;
    string a[n];
    for(int i = 0; i < n; i++)
        cin >> a[i];
    
    sort(a,a+n);

    for(int i = 1; i < n;i++){
        if(a[i-1] == a[i]) cnt++;
        else cnt = 1;
        if(cnt > max) max = cnt;
    }
    
    cout << (max <= n / 2 + n % 2 ? "YES" : "NO") << endl; 

    return 0;
}