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~.

Output

• Print one integers: the number of distinct values.

Constraints

• ~1 \le n \le 2 \cdot 10^5~
• ~1 \le x\_i \le 10^9~

Example Input

5
2 3 2 2 3

Example Output

2