Competitions

# PP2: Week 9,10: May 17 - 30

# Different-different

**n** integers are given. How many of them are different?

#### Input

The first line contains amount of numbers **n** (**1** ≤ **n** ≤ `10`

). Second line contains ^{6}**n** integers, each of them is no greater than **2** * `10`

by absolute value.^{9}

#### Output

Print the amount of different numbers.

Input example #1

1 3

Output example #1

1

Input example #2

5 9 15 22 15 22

Output example #2

3