#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
int main()
{
int n;
while (cin >> n)
{
int sum = 0;
int i;
vector<int> a(3 * n);
for (i = 0; i < 3 * n; i++)
{
cin >> a[i];
}
sort(a.begin(), a.end());
for (i = 2; i <3*n; i += 2)
{
sum += a[3 * n - i];
}
cout << sum << endl;
}
system("pause");
return 0;
}
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