#include <iostream>
using namespace std;

#define STUDENTS_COUNT 3
#define SUBJECTS_COUNT 6

struct student {
    int id;
    char name[20];
    float scores[SUBJECTS_COUNT];
};

struct student students[STUDENTS_COUNT];

int score_of_student(int student_id, int subject_id) {
    int i;
    for(i = 0; i < STUDENTS_COUNT; i++) {
        if(students[i].id == student_id) {
            return students[i].scores[subject_id];
        }
    }

    return -1;
}

float average_subject_score(int subject_id) {
    int score_sum = 0;

    int i;
    for(i = 0; i < STUDENTS_COUNT; i++) {
        score_sum += students[i].scores[subject_id];
    }

    return score_sum / STUDENTS_COUNT;
}

float average_of_all_subjects() {
    float averages_sum = 0;

    int i;
    for(i = 0; i < SUBJECTS_COUNT; i++) {
        averages_sum += average_subject_score(i);
    }

    return averages_sum / SUBJECTS_COUNT;
}

int main() {
    int i;
    for(i = 0; i < STUDENTS_COUNT; i++) {
        students[i].id = i + 1;
        scanf("%s\n", &students[i].name);

        int j;
        for(j = 0; j < 6; j++) {
            students[i].scores[j] = (i + j) % 11;
            // scanf("%d\n", &students[i].scores[j]);
        }
    }

    printf("%d\n", score_of_student(2, 3));
    printf("%f\n", average_subject_score(4));
    printf("%f\n", average_of_all_subjects());

    return 0;
}