Stepan's Friends#7401
Stepan returned from the International Olympiad in Informatics (IOI) and brought with him colored stones as souvenirs. Stepan is not a greedy boy, so he decided to share the stones with his friends. Stepan gave each friend exactly one stone. It turned out that Stepan now also has only one stone left. Determine how many friends Stepan has.
One number (1 \leq n \leq 100).
Print the number of Stepan's friends.
Example 1
Stepan brought stones, one of which he kept for himself. So the second stone he gave to his one friend.