How many different? P25401

Statement

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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≥1 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.

Public test cases

Input

5       15 12 41 15 41
5       99 99 99 99 99
1       -666
10      1 1 2 3 4 5 6 7 8 9

Output

Information