#include <bits/stdc++.h>
using ll = long long;
#define MOD 1000000007
#define Mod 998244353
const int MAX = 1000000005;
const long long INF = 1000000000000000005LL;
using namespace std;



int main() {
    ios::sync_with_stdio(0);cin.tie();
    int N, P;
    cin >> N >> P;
    vector<ll> A(N);
    for (int i = 0; i < N; i++) cin >> A[i];
    ll now = 1;
    int M = 0;
    while (now < 1000000000) {
        M++;
        now *= P;
    }
    vector<map<int, int>> C(M+1);
    now = 1;
    for (int i = 0; i <= M; i++) {
        for (int j = 0; j < N; j++) C[i][A[j] % now]++;
        now *= P;
    }
    ll ans = 0;
    now = P;
    for (int i = 1; i < M; i++) {
        for (int j = 0; j < N; j++) {
            ans += (ll)i * (C[i][A[j] % now] - C[i+1][A[j] % (now * P)]);
            C[i][A[j] % now]--;
            C[i+1][A[j] % (now * P)]--;
        }
        for (int j = 0; j < N; j++) C[i+1][A[j] % (now * P)]++;
        now *= P;
    }
    cout << ans << endl;
}