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;
  let logFailed = 0;
  let log3and4 = 0;
  let log4and5 = 0;
  let logTop = 0;
  let avarage = 0;

  for (i = 1; i <= studentsCount; i++) {
    currentStudentGrade = Number(input[i]);
    avgGrades += currentStudentGrade;
    if (currentStudentGrade <= 2.99) {
      failedStudents++;
      logFailed = (failedStudents / studentsCount) * 100;
    } else if (currentStudentGrade <= 3.99) {
      between3and4++;
      log3and4 = (between3and4 / studentsCount) * 100;
    } else if (currentStudentGrade <= 4.99) {
      between4and5++;
      log4and5 = (between4and5 / studentsCount) * 100;
    } else if (currentStudentGrade <= 6.0) {
      topStudents++;
      logTop = (topStudents / studentsCount) * 100;
    }
    avarage = avgGrades / studentsCount;
  }
  console.log(`Top students: ${logTop.toFixed(2)}%`);
  console.log(`Between 4.00 and 4.99: ${log4and5.toFixed(2)}%`);
  console.log(`Between 3.00 and 3.99: ${log3and4.toFixed(2)}%`);
  console.log(`Fail: ${logFailed.toFixed(2)}%`);
  console.log(`Average: ${avarage.toFixed(2)}`);
}