Count Distinct Values
How many distinct values does the list contain?
Input: the first line has an integer N; the second line has N integers separated by spaces.
Output: one integer — the number of distinct values.
Constraints:
- 1 ≤ N ≤ 2000
- −109 ≤ ai ≤ 109
Sample Tests
Input 1
6 1 2 2 3 3 3
Output 1
3
Input 2
4 -1 -1 -1 -1
Output 2
1
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