import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class DivisiblePair {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter comma separated list");
        List<Integer> list = Arrays.stream(scanner.nextLine().split(",")).map(Integer::valueOf).collect(Collectors.toList());
        System.out.println("Enter value of divisor");
        int k = scanner.nextInt();
        int count = 0;
        for (int i = 0; i < list.size() - 1; i++) {
            for (int j = i + 1; j < list.size(); j++) {
                if ((list.get(i) + list.get(j)) % k == 0) {
                    count++;
                }
            }
        }
        System.out.println("Output: " + count);
    }
}