#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    long long M;
    double PI = acos(-1);
    cin >> N >> M;

    vector<int> A(N);
    vector<double> Px(N);
    vector<double> Py(N);

    for (int i = 0; i < N; i++) {
        cin >> A[i];
        Px[i] = cos(2 * PI * A[i] / M);
        Py[i] = sin(2 * PI * A[i] / M);
    }

    long long ans = 0;

    for (int i = 0; i < N; i++) {
        for (int j = i + 1; j < N; j++) {
            for (int k = j + 1; k < N; k++) {
                long long a = round((Px[i] - Px[j]) * (Px[i] - Px[j]) + (Py[i] - Py[j]) * (Py[i] - Py[j]));
                long long b = round((Px[j] - Px[k]) * (Px[j] - Px[k]) + (Py[j] - Py[k]) * (Py[j] - Py[k]));
                long long c = round((Px[i] - Px[k]) * (Px[i] - Px[k]) + (Py[i] - Py[k]) * (Py[i] - Py[k]));

                
                if (a + b == c || a + c == b || b + c == a) {
                    ans++;
                }
            }
        }
    }

    cout << ans << endl;

    return 0;
}