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#include <bits/stdc++.h>

using namespace std;

int main(){
	int n, m, a, minn =2020;
	scanf("%d%d", &n, &m);
	for(int i = 1; i<=n; ++i){
		for(int j = 1; j<=i; ++j){
			scanf("%d", &a);
			int b = j*(i-(j-1));
			//cout << i << " " <<  j << " " << b << " " << minn << "   ";
			if(b <= m && a <minn){
				minn=a;
			}
		}
		//cout << '\n';
	}
	cout << minn;	
}