#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];
vi G[55];
set<vi> ps;
vi path;
void dfs(int u, int d, int s) {
    path.push_back(u);
    vis[u] = 1;
    each(v, G[u]) {
        if(vis[v] == 1 && d == 3 && v == s) {
            auto p = path;
            sort(all(p));
            ps.insert(p);
        }
        if(!vis[v]) {
            dfs(v, d + 1, s);
        }
    }
    path.pop_back();
}

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);
    }

    rep(i, N) {
        MEM(vis, 0);
        dfs(i, 0, i);
    }

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