#include<iostream>
#include<fstream>
using namespace std;
int main()

{
    unsigned long long int n=0,k=0,suma = 0;
    ifstream in("suma.in");
    ofstream out("suma.out");
    in>>n,k;
    in.close();
    if(n % 2 == 0 )
        suma = ((n%k)*((n+1)%k)*((n-1)%k)/3 );
    else
        suma = (n%k)*((n-1)%k)*((n-2)%k)/3+((n%k)*((n-1)%k));
    out<<suma;
    out.close();
    return 0;
}