#include <fstream>

using namespace std;

ifstream fin("conturi.in");
ofstream fout("conturi.out");

int main() {
  int n, x, m=0, cp, bani;
  fin >> n >> x;
  int v[n];
  for (int i = 0; i < n; i++) {
    fin >> v[i];
  }
  for (int i = 0; i < n; i++) {
    cp = v[i];
    bani = cp % 10000;
    cp = cp / 10000;
    if ((cp % 10) == 1) {
      cp = cp / 10;
      if ((cp % 10) == x) {
        if (bani > m) {
          m = bani;
        }
      }
    }
  }
  fout << m;
  
  return 0;  
}