Anti-birthdays
Štefka likes to celebrate, so apart from her birthday she came up with anti-birthdays as well: the date of anti-birthdays arises so that the number of the day and the number of the month in the date of birth are swapped. She herself was born on 8.11., so her anti-birthdays are on 11.8. Her mother cannot celebrate anti-birthdays: she was born on 23.7., her anti-birthdays should be on 7.23., which is not a date of any day of the year. Her brother is able to celebrate anti-birthdays, but he has them on the same day as his birthday: he was born on 3.3. How many days in a year are such that a person who was born on that day can celebrate his anti-birthdays, and on a different day from his birthday?
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