#include <bits/stdc++.h>
using namespace std;
template <class T>
int getbit(T s, int i) {
  return (s >> i) & 1;
}
template <class T>
T onbit(T s, int i) {
  return s | (T(1) << i);
}
template <class T>
T offbit(T s, int i) {
  return s & (~(T(1) << i));
}
template <class T>
int cntbit(T s) {
  return __builtin_popcount(s);
}
template <class T>
inline T gcd(T a, T b) {
  T r;
  while (b != 0) {
    r = a % b;
    a = b;
    b = r;
  }
  return a;
}
long long n, a[300005], k, p, res;
map<long long, long long> m;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> p >> k;
  long long mod = p;
  for (long long i = 1, _b = n; i <= _b; i++) cin >> a[i];
  for (long long i = 1, _b = n; i <= _b; i++) {
    long long tmp =
        (a[i] * a[i] % mod * a[i] % mod * a[i] % mod - k * a[i] % mod + mod) %
        mod;
    res += m[tmp];
    m[tmp]++;
  }
  cout << res;
  return 0;
}
