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#include <iostream>

int main() {
  int n, k, lowestYear, tmp;
  lowestYear = 2020;
  std::cin >> n >> k;
  for(int i = 1; i <= n; ++i) {
    for(int j = 1; j <= i; ++j) {
      std::cin >> tmp;
      if(((-(i-j)+i)*(i-j+1))>k) continue;
      else if(tmp < lowestYear) lowestYear = tmp;
    } 
  }
  std::cout << lowestYear;
}