#include <iostream>

 #include <cstdio>

 #include <cstring>

 #include <algorithm>

 using namespace std;

 const int N=;

 int n;

 int in[N];

 int main()

 {

     while (cin>>n)

     {

         for (int i=;i<*n;i++)

         {

             cin>>in[i];

         }

         sort(in,in+*n);

         if (in[n]>in[n-])

         {

             cout<<"YES"<<endl;//注意YES不要写错！

         }

         else

         {

             cout<<"NO"<<endl;

         }

     }

     return ;

 }