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

int main()
{
    int n, k;
    scanf("%d %d", &n, &k);
    int m = 2019;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= i; ++j) {
            int a;
            scanf("%d", &a);
            if (j * (i - j + 1) <= k) {
                m = min(m, a);
            }
        }
    }
    printf("%d\n", m);
    return 0;
}