using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, p) = (c[0], c[1]);
        var a = NList;
        var max = a.Max();
        var div = (long)p;
        var ans = 0L;
        while (true)
        {
            if (div >= max) break;
            var dic = new Dictionary<long, int>();
            foreach (var ai in a)
            {
                var am = ai % div;
                if (dic.ContainsKey(am))
                {
                    ans += dic[am];
                    ++dic[am];
                }
                else dic[am] = 1;
            }
            div *= p;
        }
        WriteLine(ans);
    }
}