#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
    int n;
    cin >> n;

    vector<int> x(n * n);

    for (int i = 0; i < n * n; i++)
    {
        cin >> x[i];
    }

    sort(x.begin(), x.end());

    cout << x[n * n - 1] << endl;
    return 0;
}