#include <iostream>
#include<fstream>

using namespace std;

bool getdata(int value) {
    bool isntCorrect = false;
    if ((value > 10) || (value < 0)) {
        cout << "Invalid file data. Value from " << 0 << "to " << 10 << " expected";
        isntCorrect = true;
        return isntCorrect;
    }
}
bool checkdata(int marks [30][10]) {
    bool isntCorrect = false;
    for (int i = 0; i < 30; i++)
        for (int j = 0; j < 10; j++)
            if  (!getdata(marks[i][j])) {
                isntCorrect = true;
            }
    return checkdata;
}

int getNumberOfBadStudents(int marks [30][10]) {
    int counter = 0;
    bool badStudents;
    for (int i = 0; i < 30; i++) {
        badStudents = false;
        for (int j = 0; j < 10; j++) {
            if ((marks[i][j] < 4) && (!badStudents)) {
                counter++;
                badStudents = true;
            }
        }
    }
    return counter;
}
void body() {
    int marks [30][10];
    int numberOfBadStudents;
    bool isntCorrect = false;
    ifstream fin("D:\\input.txt");
    ofstream fout("D:\\output.txt");
    for (int i = 0; i < 30; i++) {
        cout << "\n";
        for (int j = 0; j < 10; j++) {
            fin >> marks[i][j];
            cout << marks[i][j] << " ";
        }
    }
    isntCorrect = checkdata(marks);
    if (isntCorrect) {
        numberOfBadStudents = getNumberOfBadStudents(marks);
        fout << "\nNumber of bad students: " << numberOfBadStudents;
        cout << "\nNumber of bad students: " << numberOfBadStudents;
    }
    else
        cout << "File input.txt does not exist";
}
int main() {
    body();
    return 0;
}