#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull  = unsigned long long;
template < class T > bool chmin(T& a, T b) { if(a > b) { a = b; return true; } return false; }
template < class T > bool chmax(T& a, T b) { if(a < b) { a = b; return true; } return false; }

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll N,P; cin >> N >> P;
    vector<ll> A(N);
    rep(i,N) cin >> A[i];
    sort(A.begin(), A.end());
    ll ans = 0;
    for(ll Pk = P; Pk <= ll(1e9); Pk *= P) {
        map<ll,ll> mp;
        rep(i,N) {
            ll x = A[i] % Pk;
            if(mp.count(x)) ans += mp[x];
            mp[x]++;
        }
    }
    cout << ans << endl;
}