#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n) for (int i=0;i<(int)(n);i++)

int main(){
  int n,p;
  cin>>n>>p;
  vector<int> a(n);
  rep(i,n) cin>>a.at(i);
  ll np=p;
  ll ans=0;
  rep(i,32){
    map<int,ll> na;
    rep(i,n) na[a.at(i)%np]++;
    for(auto [nw,nm]:na){
      ans+=nm*(nm-1)/2;
    }
    np*=p;
  }
  cout<<ans<<endl;
}