#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <stdlib.h>
#include <thread>


std::vector<std::string> input;
std::vector<int> numbers;




void handle_file() {
   std::ifstream file;
   try {
       file.open(input[input.size()-1]);
   }
   catch(std::exception) {
       exit(1);
   }
   input.pop_back();


   while (file.good())
   {
       int num;
       file >> num;


       numbers.push_back(num);
   }
   file.close();

   return;
}


int main(int argc, char * argv[]) {
   std::ifstream file;

   file.open(argv[1]);


   while (file.good()) {
       std::string path;
       file >> path;


       input.push_back(path);
   }
   file.close();


   int k = std::atoi(argv[2]);


   for (int i = 0; i < k; ++i) {
       std::thread newThread(handle_file);
   }


   int max = numbers[0];
   for (int i = 0; i < numbers.size(); ++i) {
       if (numbers[i] > max) {
           max = numbers[i];
       }
   }


   std::cout << max << std::endl;


   return 0;
}