exam preparation 2/10

marks = int(input())
bad_grade_cnt = 0
last_problem = ''
problem_cnt = 0
grades_sum = 0

while True:
    problem_num = input()
    if problem_num == 'Enough':
       break
    grade = int(input())

    if grade <= 4:
        bad_grade_cnt += 1

    if bad_grade_cnt >= marks:
        break

    last_problem = problem_num
    problem_cnt += 1
    grades_sum += grade

if bad_grade_cnt < marks :
    average_score = grades_sum / problem_cnt
    print(f'Average score: {average_score:.2f}')
    print(f'Number of problems: {problem_cnt}')
    print(f'Last problem: {last_problem}')
else:
    print(f'You need a break, {bad_grade_cnt} poor grades.')