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#include <bits/stdc++.h>

using namespace std;

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

    int global_min = INT_MAX;
    for (int x = 1; x <= n; x++) {
        for (int y = 1; y <= x; y++) {
            int year;
            cin >> year;
            if (((long long) (x - y + 1)) * y <= k) {
                global_min = min(global_min, year);
            }
        }
    }
    cout << global_min << "\n";
}