A. Distinct Numbers
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output

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

Input

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

The second line has $$$n$$$ integers $$$x_1,x_2,\dots,x_n$$$.

Constraints:

  • $$$1 \le n \le 2 \cdot 10^5$$$
  • $$$1 \le x_i \le 10^9$$$
Output

Print one integer: the number of distinct values.

Example
Input
5
2 3 2 2 3
Output
2