#include <fstream>
#include <functional>
#include <random>
#include <string>

const std::size_t N = 512, NAME = 10;
const std::string path = "/tmp/";

std::random_device device;
std::default_random_engine engine(device());
std::uniform_int_distribution<std::size_t> distribution(0, NAME - 1);
auto rng = std::bind(distribution, engine);

void work(std::size_t begin, std::size_t end)
{
    for (std::size_t i = begin; i < end; ++i)
    {
        std::size_t x = 0, max = 0;
        try
        {
            std::ifstream ifs(path + std::to_string(rng()) + ".txt",
                              std::ios::in);
            while (ifs)
            {
                ifs >> x;
                max = std::max(max, x);
            }
            std::ofstream ofs(path + std::to_string(rng()) + ".txt",
                              std::ios::app);
            ofs << max + 1 << std::endl;
        }
        catch (...)
        {
        }
    }
}