How many different?

Write a program that prints how many different numbers there are in a sequence with $n$ integer numbers.

Input

Input contains different test data. Each test data starts with a natural number $n\ge1$ followed by a sequence with $n$ integer numbers.

Output

For each sequence of the input print, in a line, the number of different elements that contains.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-02-18T13:43:45.045Z

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