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#include <bits/stdc++.h>
using namespace std;
using vi=vector<int>;
using ll=long long;
#define pb push_back
#define fst first
#define snd second
using vll=vector<ll>;
using Pii=pair<int,int>;
using Pll=pair<ll,ll>;
using vpii=vector<Pii>;
#ifndef LOCAL
#pragma GCC optimize("O3")
#endif
#define sim template <class c
#define mor > muu & operator<<(
#define ris return *this
#define R22(r) sim> typename enable_if<1 r sizeof(dud<c>(0)),muu&>::type operator<<(c g) {
sim> struct rge {c b, e;};
sim> rge<c> range(c i, c j) {return rge<c>{i, j};}
sim> auto dud(c*r)->decltype(cerr << *r);
sim> char dud(...);
struct muu {
	#ifdef LOCAL
	stringstream a;
	~muu() {cerr << a.str() << endl;}
	R22(<) a << boolalpha << g; ris;}
	R22(==) ris << range(begin(g), end(g));}
	sim mor rge<c> u) {
		a << "[";
		for (c i = u.b; i != u.e; ++i)
			*this << ", " + 2 * (i == u.b) << *i;
		ris << "]";
	}
	sim, class m mor pair<m,c> r) {ris << "(" << r.first << ", " << r.second << ")";}
	#else
	sim mor const c &){ris;}
	#endif
	muu & operator()(){ris;}
};
#define imie(r) "[" #r ": " << (r) << "] "
#define debug (muu() << __FUNCTION__ << "#" << __LINE__ << ": " )
const int maxn = 3000;

int n, k;
int up[maxn][maxn];
int main()
{
	scanf("%d%d", &n, &k);
	for(int i = 0; i < n; ++i)
	{
		up[i][0] = up[i][i] = i + 1;
		for(int j = 1; j < i; ++j)
			up[i][j] = up[i-1][j] + up[i-1][j-1] - up[i-2][j-1] + 1;
	}
	int piramida;
	int res = 2137;
	for(int i = 0; i < n; ++i)
		for(int j = 0; j <= i; ++j)
		{
			scanf("%d", &piramida);
			if(up[i][j] <= k)
				res = min(piramida, res);
		}
	printf("%d\n", res);
}