#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define mt make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

int vis[55], adj[55][55], con[55][55];
vi G[55];

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

    int N, M;
    cin >> N >> M;
    rep(i, M) {
        int a, b;
        cin >> a >> b;
        G[a].push_back(b);
        G[b].push_back(a);
        adj[a][b] = adj[b][a] = 1;
    }

    set<vi> ps;
    // 50^4
    rep(a, N)rep(b, N)rep(c, N)rep(d, N) {
        vi p{a,b,c,d};
        set<int> uni(all(p));
        if(sz(uni) != 4)continue;
        int ok = 1;
        rep(i, 4) {
            ok &= adj[p[i]][p[(i+1)%4]];
            ok &= !adj[p[i]][p[(i + 2) % 4]];
        }
        
        sort(all(p));
        if(ok)ps.insert(p);
    }

    cout << sz(ps) << endl;
}