#include <fstream>
#include <algorithm>
#include <unordered_map>
#include <cmath>
using namespace std;

ifstream input_stream;
ofstream output_stream;


void getNumRepr(int num, char res[10]) {
    res[9] = '0' + (num % 10);
    num /= 10;  // 406
    res[8] = '0' + (num % 10);
    num /= 10;  // 40
    res[7] = '.';

    for (int i = 6; i >= 0; i--) {
        if (num > 0) {
            res[i] = '0' + num % 10;
            num /= 10;
        } else {
            res[i] = ' ';
        }
    }
}

int main() {
    input_stream.open("energie.in");
    output_stream.open("energie.out");

    int N;
    input_stream >> N;

    int consume[N];
    int sum = 0;
    unordered_map<int, string> lnames, fnames;

    for (int i = 0; i < N; i++) {
        string tmp_lname, tmp_fname;
        input_stream >> tmp_lname;
        input_stream >> tmp_fname;
        input_stream >> consume[i];
        lnames[consume[i]] = tmp_lname;
        fnames[consume[i]] = tmp_fname;
        sum += consume[i];
    }

    double medium = double(sum) / double(N);
    medium *= 100;
    medium = round(medium);

    char medRepr[10];
    getNumRepr(int(medium), medRepr);

    for (int i = 0; i < 10; i++) {
        output_stream << medRepr[i];
    }
    output_stream << endl;

    sort(consume, consume + N);
    for (int i = N - 1; i >= 0; i--) {
        output_stream << lnames[consume[i]] << " ";
        output_stream << fnames[consume[i]] << " ";
        output_stream << consume[i] << endl;
    }

    input_stream.close();
    output_stream.close();
    return 0;
}