#include using namespace std; using ll = long long; using pll = pair; #define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i) #define rep(i, n) drep(i, 0, n - 1) #define all(a) (a).begin(), (a).end() #define pb push_back #define fi first #define se second const ll MOD = 1000000007; const ll MOD2 = 998244353; const ll INF = 1LL << 60; const ll MAX_N = 2e5; int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); ll N, P; cin >> N >> P; vector A(N); rep(i, N) cin >> A[i]; ll ans = 0; ll PP = P; while(PP <= 1e9){ vector B(N); rep(i, N) B[i] = A[i]%PP; ll cnt = 0; map mp; rep(i, N){ cnt += mp[B[i]]; mp[B[i]]++; } ans += cnt; PP *= P; } cout << ans << endl; }