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#include <iostream>
using namespace std;

int main(){
	int n, k, w, wm=2019;
	scanf("%d %d", &n, &k);
	for (int p=1; p<=n; p++){
		for (int d=1; d<=p; d++){
			scanf("%d", &w);
			if ((w<wm)&&(((p-d+1)*d)<=k)) wm=w;
		}
	}
	printf("%d", wm);
	return 0;
}