# #비교연산
# print(1 == 1)
# print(2 != 0)
# print(3 > 1)
# print(1 < 3)
# print(12 >= 12)
# print(2 <= 1)

# #논리연산
# print(1 > 2 and 1 == 1)
# print(1 == 1 or 1 > 2)
# print(not 2>3)

#if문
age = int(input())
if age >= 8 and age <= 13:
    print("초등학생입니다")
elif age >= 14 and age <= 16:
    print("중학생입니다")
elif age >= 17 and age <= 19:
    print("고등학생입니다")
else:
    print("학생이 아닙니다.")