Competitions
Week 1 Introduction Part 1
Stepan Friends
Stepan returned from International Olympiad in Informatics (IOI) and brought with him n colored stones as souvenirs. Stepan is not a greedy boy, so he decided to share stones with his friends. Stepan gave to each friend exactly one stone. It turned out that Stepan has now also only one stone. Determine how many friends has Stepan.
Input data
One number n (1 ≤ n ≤ 100).
Output data
Print the number of Stepan's friends.
Examples
Input example #1
2
Output example #1
1
Note
Stepan brought 2 stones, one of which he left for himself. So the second stone he gave to his one friend.