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#include <iostream>

int main() {
    int n, k, x, wyn = 13371337;
    scanf("%d%d", &n, &k);
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            scanf("%d", &x);
            if (j * (i - j + 1) <= k) {
                wyn = std::min(wyn, x);
            }
        }
    }
    printf("%d", wyn);
    return 0;
}