DWITE Online Computer Programming Contest, October 2009, Problem 3

You have a continuous sequence of unique numbers, ~1, \dots, N~, that you like very much, but your little sister always steals one (and only one), and randomly re-arranges the rest in an attempt to hide the crime. Given ~N-1~ numbers, in a random order, find out which number was taken.

The input will contain 5 sets of input. The first line will be an integer ~1 \le M \le 100~, the number of items remaining. Followed by ~M~ lines of unique integers, from at least ~1~ to at most ~M+1~.

The output will contain 5 lines, each an integer from the missing set.

Note: the original sorted sequence is ~\{1, 2, \dots, N\}~. Any of the numbers (including ~1~ or ~N~) can be taken.

Sample Input

2
1
2
2
2
3
2
1
3

Sample Output

3
1
2

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) Problem Resource: DWITE