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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cout.precision(15);
    cout << fixed;
    cin.tie(0);

    int n, k;
    cin >> n >> k;
    int ans = 10000;
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < i; j++) {
            int x;
            cin >> x;
            int need = (j+1) * (i-j);
            if (need <= k) {
                ans = min(ans, x);
            }
        }
    }
    cout << ans << endl;

    return 0;
}