#include <iostream>
#include <algorithm>
#include <cstdio>

using namespace std;

const int maxn = 1000 + 24;
int a[maxn];

int main()
{
    int n;
    while (scanf("%d", &n) == 1)
    {
        int sum = 0;
        for (int i = 0; i < n; i++)
        {
            scanf("%d", &a[i]);
            sum += a[i];
        }
        sort(a, a+n);
        if (sum % n == 0)
        {
            int avg = sum / n;
            if (avg >= a[(n + 1) / 2 - 1])
                printf("NO\n");
            else
                printf("YES\n");
        }
        else
        {
            double avg = 1.0 * sum / n;
            if (avg > a[(n + 1) / 2 - 1])
                printf("NO\n");
            else
                printf("YES\n");
        }
    }
    return 0;
}