include

using namespace std; int main(){

int n,k;
cin>>n>>k;
int a[n];
for(int i=0;i<n;i++){
cin>>a[i];
}
int count=0;
for(int i=0;i<n;i++){
    for(int j=i+1;j<n;j++){
        if((a[i]+a[j])%k==0){
            count++;
        }
    }
}
cout<<count<<endl;

}