#include <bits/stdc++.h>
using namespace std;
#define file ""
#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define getbit(x, i) (((x) >> (i)) & 1)
#define bit(x) (1LL << (x))
#define popcount __builtin_popcountll
mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
return l + rd() % (r - l + 1);
}
const int N = 1e6 + 5;
const int mod = (int)1e9 + 7; // 998244353;
const int lg = 25; // lg + 1
const int oo = 1e9;
const long long ooo = 1e18;
template<class X, class Y> bool mini(X &a, Y b) {
return a > b ? (a = b, true) : false;
}
template<class X, class Y> bool maxi(X &a, Y b) {
return a < b ? (a = b, true) : false;
}
void add(int &a, int b) {
a += b;
if (a >= mod) a -= mod;
if (a < 0) a += mod;
}
int n, m;
set<int> adj[N];
void unite(int u, int v) {
if (adj[u].size() > adj[v].size()) swap(adj[u], adj[v]);
for (int i : adj[u]) adj[v].insert(i);
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
// freopen(file".inp", "r", stdin);
// freopen(file".out", "w", stdout);
cin >> n >> m;
for (int i = 1; i <= m; ++i) {
int u, v;
cin >> u >> v;
if (u > v) swap(u, v);
adj[u].insert(v);
}
long long ans = 0;
for (int u = 1; u <= n; ++u) if (adj[u].size()) {
ans += adj[u].size();
int v = *adj[u].begin();
adj[u].erase(adj[u].begin());
if (adj[u].size() > adj[v].size()) swap(adj[u], adj[v]);
for (int x : adj[u]) adj[v].insert(x);
adj[u].clear();
}
cout << ans << '\n';
return 0;
}
/*
*/
