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Contest: Task: Related: TaskA TaskC

Score : $200$ points

Problem Statement

In a sequence of $N$ positive integers $a = (a_1, a_2, \dots, a_N)$, how many different integers are there?

Constraints

  • $1 \leq N \leq 1000$
  • $1 \leq a_i \leq 10^9 \, (1 \leq i \leq N)$
  • All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$
$a_1$ $\ldots$ $a_N$

Output

Print the answer.

Sample Input 1

6
1 4 1 2 2 1

Sample Output 1

3

There are three different integers: $1, 2, 4$.

Sample Input 2

1
1

Sample Output 2

1

Sample Input 3

11
3 1 4 1 5 9 2 6 5 3 5

Sample Output 3

7