#ifdef LOCAL
#include <local.hpp>
#else
#include <bits/stdc++.h>
#define debug(...) ((void)0)
#define postprocess(...) ((void)0)
#endif

using namespace std;
using ll = long long;
using ld = long double;

void solve([[maybe_unused]] int test) {
    ll N, P;
    cin >> N >> P;

    vector<ll> A(N);
    for (auto&& x : A) {
        cin >> x;
    }

    ll ans = 0;

    ll MOD = P;

    while (MOD <= *max_element(A.begin(), A.end())) {
        map<ll, int> m;
        for (int i = 0; i < N; i++) {
            ll rem = A[i] % MOD;
            ans += m[rem];
            m[rem]++;
        }

        MOD *= P;
    }

    cout << ans << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;
    for (int i = 1; i <= t; i++) {
        solve(i);
    }

    postprocess();
}