// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
    }
}

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        HashSet<Integer> hSet = new HashSet<>();
        for (int n : A) {
            hSet.add(n);
        }
        return hSet.size();
    }
}

// you can also use imports, for example:
// import java.util.*;
import java.util.HashSet;
// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        HashSet<Integer> hSet = new HashSet<>();
        for (int n : A) {
            hSet.add(n);
        }
        return hSet.size();
    }
}

// you can also use imports, for example:
// import java.util.*;
import java.util.HashSet;
// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        HashSet<Integer> hSet = new HashSet<>();
        for (int n : A) {
            hSet.add(n);
        }
        return hSet.size();
    }
}