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#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, k;
    while (cin >> n >> k) {
        int result = INT_MAX;
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j <= i; ++j) {
                int value;
                cin >> value;
                int x = j + 1;
                int y = i - j + 1;
                if (x * y <= k)
                    result = min(result, value);
            }
        }

        cout << result << '\n';
    }
}