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#include <iostream>
#include <vector>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, k, result = 2020;
    cin >> n >> k;

    vector<vector<int>> years(n, vector<int>(n, 0));
    vector<vector<int>> steps(n, vector<int>(n, 0));

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

    for (int i = 0; i < n; ++i)
    {
        steps[i][0] = i + 1;
        steps[i][i] = i + 1;
        if (i + 1 <= k)
        {
            result = min(result, years[i][0]);
            result = min(result, years[i][i]);
        }
    }

    for (int i = 2; i < n; ++i)
    {
        for (int j = 1; j < i; ++j)
        {
            steps[i][j] = steps[i - 1][j - 1] + steps[i - 1][j] - steps[i - 2][j - 1] + 1;
            if (steps[i][j] <= k)
            {
                result = min(result, years[i][j]);
            }
        }
    }

    cout << result << "\n";

    return 0;
}