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#include <iostream>
//Kisielinski Damian
using namespace std;

int main(int argc, char** argv) {
	ios_base::sync_with_stdio(0);
	int n, k, b, x, min=2020;
	cin>>n>>k;
  for (int r = 1; r <= n; r++) {
    for (int p = 1; p <= r; p++) {
      cin>>b;
      x = (r+1-p)*p;
      if (x<=k && b < min) {
        min = b;
      }
    }
  }

	cout<<min<<endl;
	return 0;
}