Distinct Numbers

You are given a list of $nn$ integers, and your task is to calculate the number of distinct values in the list.

Input

The first input line has an integer $nn$: the number of values.

The second line has $nn$ integers $x_1,x_2,\dots ,x_{n}x\_1,x\_2,\backslash dots,x\_n$.

Output

Print one integers: the number of distinct values.