Unique elements in a list

Python Easy sets

Task «Unique elements in a list»

Given a natural number N, followed by N integers. It is required to output the number of unique numbers in the entered list. Use a set to solve the problem.

Input Format

In the first line, an integer N (1 ≤ N ≤ 1000). In the second line, N integers separated by spaces.

Output Format

An integer — the number of unique numbers in the list.

Examples

Example 1

INPUT

5
1 2 3 4 5

OUTPUT

5

Example 2

INPUT

6
1 1 2 2 3 3

OUTPUT

3

Example 3

INPUT

1
42

OUTPUT

1

Example 4

INPUT

5
3 1 4 1 5

OUTPUT

4

main.py