function grades(input) {

    let studentsCount = Number(input[0]);
    let currentStudentGrade = 0;
    let failedStudents = 0;
    let between3and4 = 0;
    let between4and5 = 0;
    let topStudents = 0;
    let avgGrades = 0;

    for (i = 1; i <= studentsCount; i++) {
        currentStudentGrade = Number(input[i]);
        avgGrades += currentStudentGrade;
        if (currentStudentGrade <= 2.99) {
            failedStudents++;
        } else if (currentStudentGrade <= 3.99) {
            between3and4++;
        } else if (currentStudentGrade <= 4.99) {
            between4and5++;
        } else if (currentStudentGrade <= 6.00) {
            topStudents++;
        }
    }
        avgGrades /= studentsCount * 100;
        failedStudents /= studentsCount * 100;
        between3and4 /= studentsCount * 100;
        between4and5 /= studentsCount * 100;
        topStudents /= studentsCount * 100;

    console.log(`Top students: ${topStudents.toFixed(2)}%`);
    console.log(`Between 4.00 and 4.99: ${between4and5.toFixed(2)}%`);
    console.log(`Between 3.00 and 3.99: ${between4and5.toFixed(2)}%`);
    console.log(`Fail: ${failedStudents.toFixed(2)}%`);
    console.log(`Average: ${avgGrades.toFixed(2)}`);
}