#include <algorithm>
#include <climits>
#include <iostream>
#include <vector>

using namespace std;

struct edge {
    int u, v;
};

vector<vector<int>> graph;
vector<int> t;
vector<int> l;
vector<bool> done;
int tm;
int bs;

void dfs(int const cur, int const par) {
    done[cur] = true;

    t[cur] = tm;
    tm++;
    l[cur] = t[cur];

    for (int const& neigh : graph[cur]) {
        if (done[neigh]) {
            if (neigh != par)
                l[cur] = min(l[cur], t[neigh]);
            continue;
        }

        dfs(neigh, cur);

        l[cur] = min(l[cur], l[neigh]);
    }

    if (l[cur] == t[cur] && par != -1)
        bs++;
}

void busy() {
    for (int i = 0; i < graph.size(); i++) {
        t[i] = -1;
        l[i] = INT_MAX / 2;
        done[i] = false;
    }
    tm = 0;
    bs = 0;

    for (int i = 0; i < graph.size(); i++)
        if (!done[i])
            dfs(i, -1);

    /*for (int i = 0; i < graph.size(); i++) {
        cout << t[i] << " " << l[i] << "\n";
    }*/

    cout << bs << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n, m;
    cin >> n >> m;

    graph.resize(n);
    t.resize(n);
    l.resize(n);
    done.resize(n);
    vector<edge> edges(m);

    for (auto& e : edges) {
        cin >> e.u >> e.v;
        e.u--; e.v--;

        graph[e.u].push_back(e.v);
        graph[e.v].push_back(e.u);
    }

    for (auto& e : edges) {
        graph[e.u].erase(find(graph[e.u].begin(), graph[e.u].end(), e.v));
        graph[e.v].erase(find(graph[e.v].begin(), graph[e.v].end(), e.u));

        busy();

        graph[e.u].push_back(e.v);
        graph[e.v].push_back(e.u);
    }
}