#include <bits/stdc++.h>
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define FORR(i,a,b) for (int i=(a);i>=(b);i--)
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef set<int> si;
const int inf = 1e9;
const int mod = 1e9+7;

int n, m;
bool li[50][50];
main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> n >> m;
  FOR(i, 0, m){
    int a, b;
    cin >> a >> b;
    li[a][b] = true;
    li[b][a] = true;
  }
  vi c;
  ll ans = 0;
  FOR(i, 0, n-1)FOR(j, i + 1, n){
    if(li[i][j]) continue;
    c.clear();
    FOR(k, 0, n){
      if(li[i][k] && li[j][k]) c.pb(k);
    }
    if(c.size() < 2) continue;
    FOR(k, 0, c.size()-1)FOR(l, k+1, c.size()){
      if(!li[c[k]][c[l]]){
        ans++;
      }
    }
  }
  cout << ans/2 << endl;
}