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#include <bits/stdc++.h>

using u32 = uint32_t;
using u64 = uint64_t;
using i32 = int32_t;
using i64 = int64_t;

int main()
{
	std::ios_base::sync_with_stdio(0);

	u64 n;
	u64 k;

	std::cin >> n >> k;

	u64 ans = 2019;

	for(u64 i=1; i<=n; ++i)
	{
		for(u64 j=1; j<=i; ++j)
		{
			u64 x;
			std::cin >> x;

			if(x < ans)
			{
				u64 m = j * (i-j+1);

				if(m<=k)
				{
					ans = x;
				}
			}
		}
	}

	std::cout << ans << "\n";

	return 0;
}