#include<iostream>
#include<vector>
#include<algorithm>
#include<map>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    ll P;
    cin>>N>>P;
    vector<ll>A(N);
    rep(i,N)cin>>A[i];
    vector<ll>C(30);
    ll q=P;
    rep(i,30){
        if(q>1e9)break;
        map<ll,ll>mp;
        rep(j,N){
            mp[A[j]%q]++;
        }
        for(auto[x,y]:mp)C[i]+=y*(y-1)/2;
        q*=P;
    }
    rep(i,29)C[i]-=C[i+1];
    ll ans=0;
    rep(i,30)ans+=(i+1)*C[i];
    cout<<ans<<"\n";
}