04. Grades

students = int(input())

very_good_grades = 0
good_grades = 0
middle_grades = 0
low_grades = 0
total_grades = 0

for i in range(students):
    grade = float(input())
    total_grades += grade
    if grade >= 5:
        very_good_grades += 1
    elif 4 <= grade <= 4.99:
        good_grades += 1
    elif 3 <= grade <= 3.99:
        middle_grades += 1
    else:
        low_grades += 1

print(f"Top students: {very_good_grades / students * 100:.2f}%")
print(f"Between 4.00 and 4.99: {good_grades / students * 100:.2f}%")
print(f"Between 3.00 and 3.99: {middle_grades / students * 100:.2f}%")
print(f"Fail: {low_grades / students * 100:.2f}%")
print(f"Average: {total_grades / students:.2f}")