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#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, k;
    cin >> n >> k;

    int res = 1e9;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            int above = i * (i + 1) / 2;
            above -= (j - 1) * j / 2;
            above -= (i - j) * (i - j + 1) / 2;

            int a;
            cin >> a;
            if (above <= k) {
                res = min(res, a);
            }
        }
    }
    cout << res << endl;
}