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#include <bits/stdc++.h>
#define pb push_back

using namespace std;
int N,K,co,mini = 2020;

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin >> N >> K;
	int pl,mi;
	for(int i = 1;i<=N;i++){
		pl = 0;
		for(int j = 1;j<=i;j++){
			cin >> co;
			if(K >= (i-pl)*j){
				mini = min(mini,co);
			}
			pl++;
		}
	}
	cout << mini << '\n';
}