grades

number_of_students = int(input())
average_success = float()
top_student = 0
between_4_and_4_99 = 0
between_3_and_3_99 = 0
fails = 0
total_grades = float()
for each_student in range(1, number_of_students + 1):
    grade = float(input())
    if grade >= 5.00:
        top_student += 1
        total_grades += grade
    elif grade >= 4:
        between_4_and_4_99 += 1
        total_grades += grade
    elif grade >= 3:
        between_3_and_3_99 += 1
        total_grades += grade
    else:
        fails += 1
        total_grades += grade

top_percent = top_student/number_of_students*100
print(f'Top students: {top_percent:.2f}%')
between_4_and_4_99_percent = between_4_and_4_99/number_of_students*100
print(f'Between 4.00 and 4.99: {between_4_and_4_99_percent:.2f}%')
between_3_and_3_99_percent = between_3_and_3_99/number_of_students*100
print(f'Between 3.00 and 3.99: {between_3_and_3_99_percent:.2f}%')
fail_percent = fails/number_of_students*100
print(f'Fail: {fail_percent:.2f}%')
average_grade = total_grades/number_of_students
print(f'Average: {average_grade:.2f}')