import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int p = Integer.parseInt(sa[1]);
		sa = br.readLine().split(" ");
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sa[i]);
		}
		br.close();

		long ans = 0;
		long p2 = p;
		while (p2 <= 1000000000) {
			Map<Integer, Integer> map = new HashMap<>();
			for (int i = 0; i < n; i++) {
				int k = (int) (a[i] % p2);
				int v = map.getOrDefault(k, 0);
				ans += v;
				map.put(k, v + 1);
			}
			p2 *= p;
		}
		System.out.println(ans);
	}
}