# Number of different elements

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 64 megabytes

Given an array of N integers, your task is to find out how many distinct elements are present in the array.

## Input

The first line contains the integer N, representing the number of elements in the array. The second line contains N integers, where each integer does not exceed 2000 in absolute value.

## Output

Output the count of distinct elements in the array.

## Examples

Input #1

Answer #1

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