#include <bits/stdc++.h> #include <atcoder/all> // url #define rep(i,a,b) for(int i=a;i<b;i++) #define rrep(i,a,b) for(int i=b-1;i>=a;i--) #define all(x) (x).begin(),(x).end() #define pb(x) push_back(x); template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; } template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; } typedef long long ll; typedef long double lld; using namespace std; using namespace atcoder; using mint = static_modint<998244353>; // using mint = static_modint<1000000007>; const ll mod=998244353; //const ll mod=1e9+7; int dx[4]={1,0,-1,0}; int dy[4]={0,1,0,-1}; const string zton="0123456789"; const string atoz="abcdefghijklmnopqrstuvwxyz"; const string ATOZ="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; const ll inf=(1ll<<60); // const int inf=(1<<30); lld dist(lld x1,lld x2,lld y1,lld y2){ lld res=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2); res=sqrt(abs(res)); return res; } lld arg(lld x,lld y){ const lld eps=1e-8; lld res=0; if(abs(x)+abs(y)<=eps)return 0.0; else if(abs(x)<=eps){ if(y>=0.0)return (M_PI/2); else return (M_PI/2+M_PI); } else if(abs(y)<=eps){ if(x>=0.0)return 0.0; else return M_PI; } res=atan2(abs(y),abs(x)); if(x<=0&&y>=0)res=(M_PI-res); else if(x<=0&&y<=0)res+=(M_PI); else if(x>=0&&y<=0)res=(M_PI*2-res); return res; } ll gcd(ll a,ll b){ if(a==0||b==0)return a+b; ll r; r=a%b; if(r==0){ return b; } else{ return gcd(b,r); } } typedef pair<ll,int> P; int main(void){ ios::sync_with_stdio(false); cin.tie(nullptr); ll N;cin >> N; ll p;cin >> p; map<ll,ll> cnt[30]; ll A[N];rep(i,0,N)cin >> A[i]; sort(A,A+N);reverse(A,A+N); ll ans=0; rep(i,0,N){ ll tmp=p; rep(j,0,30){ ll b=A[i]%tmp; if(cnt[j].count(b)){ ans+=cnt[j][b]; } cnt[j][b]++; if(A[i]>=tmp){ tmp*=p; } } } cout << ans << endl; }