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#include <iostream>
 #include <stdio.h>
 using namespace std;

  int main() {
    int n;
    int k;
    cin >> n;
    cin >> k;

    int bestYear = 2020;
    for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= i; j++) {
        int year;
        cin >> year;
        if ((i + 1 - j) * j <= k && year < bestYear) {
          bestYear = year;
        }
      }
    }

    printf("%d", bestYear);
    return 0;
  }