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#include <cstdio>
#include <algorithm>

int main() {
    int n, k;
    scanf("%d %d", &n, &k);

    int m = 3000;

    for (int r = 1; r <= n; r++) {
        for (int c = 1; c <= r; c++) {
            int a;
            scanf("%d", &a);
            if (c * (r - c + 1) <= k) {
                m = std::min(m, a);
            }
        }
    }
    printf("%d\n", m);
}