#include <algorithm>
#include <fstream>
#include <iterator>
#include <numeric>
#include <sstream>
#include <vector>
#include <iostream>

namespace std
{
    std::istream& operator>>(std::istream& is, std::vector<int>& set)
    {
        std::string line;
    
        std::getline(is, line);
        std::istringstream iss { line };
    
        set = { std::istream_iterator<int> { iss },
                std::istream_iterator<int> { } };
    
        return is;    
    }
}

int main()
{
    std::ifstream ifs { "data.txt" };

    int n;
    std::cin >> n;
    
    std::vector<std::vector<int>> data {
        std::istream_iterator<std::vector<int>> { ifs },
        std::istream_iterator<std::vector<int>> { }
    };

    std::vector<double> averages (data.size());
    std::transform(std::begin(data), std::end(data),
                   std::begin(averages),
                   [](std::vector<int> const& set)
                   {
                       double sum { std::accumulate(std::begin(set), std::end(set), 0.0) };
                       return sum / set.size();
                   });
    
    std::partial_sort(std::begin(averages), std::next(std::begin(averages), n),
                      std::end(averages), std::greater<double>{});

    std::copy_n(std::begin(averages), n,
                std::ostream_iterator<double>{std::cout, "\n"});
}