#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint1000000007;

int main(){
	int n,m;
	cin>>n>>m;
	vector<int> a(n);
	rep(i,n) cin>>a.at(i);
	if(m&1){
		cout<<0<<endl;
		return 0;
	}
	rep(i,n) a.at(i)%=m;
	set<int> st;
	rep(i,n) st.insert(a.at(i));
	ll ans=0;
	rep(i,n){
		if(st.count((a.at(i)+m/2)%m)) ans+=n-2;
	}
	cout<<ans/2<<endl;
}