function solve(grades) {
    grades = grades.map(Number);
    let studentsNumber = grades.shift();

    let sumAllGrades = 0;
    let lowOrEq2_99 = 0;
    let lowOrEq3_99 = 0;
    let lowOrEq4_99 = 0;
    let bigOrEq5 = 0;

    for (let grade of grades) {
        if (grade < 2 || grade > 6) {
            continue;
        }
        if (grade <= 2.99) {
            lowOrEq2_99++;
        } else if (grade <= 3.99) {
            lowOrEq3_99++;
        } else if (grade <= 4.99) {
            lowOrEq4_99++;
        } else {
            bigOrEq5++;
        }
        sumAllGrades += grade;
    }

    let averageGrade = (sumAllGrades / studentsNumber).toFixed(2);
    let percentFailed = (lowOrEq2_99 / studentsNumber) * 100;
    let percent3_99 = (lowOrEq3_99 / studentsNumber) * 100;
    let percent4_99 = (lowOrEq4_99 / studentsNumber) * 100;
    let percent5 = (bigOrEq5 / studentsNumber) * 100;

    console.log(`Top students: ${percent5.toFixed(2)}%`);
    console.log(`Between 4.00 and 4.99: ${percent4_99.toFixed(2)}%`);
    console.log(`Between 3.00 and 3.99: ${percent3_99.toFixed(2)}%`);
    console.log(`Fail: ${percentFailed.toFixed(2)}%`);
    console.log(`Average: ${averageGrade}`);
}