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#include <cstdio>

using namespace std;

int main()
{
	int n, k;
	int min = 2020;
	scanf("%d%d", &n, &k);
	for (int i = 0; i < n; i++) {
		int row = i + 1;
		for (int j = 0; j <= i; j++) {
			int in_row = j + 1;
			int x;
			scanf("%d", &x);
			int removes = in_row * (row - in_row + 1);
			if (removes <= k) {
				if (x < min) min = x;
			}
		}
	}
	printf("%d", min);
}