#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<P> es(m);
  for(auto& [u, v]: es) cin >> u >> v, u--, v--;
  reverse(all(es));
  dsu d(n);
  VI h(n);
  for(auto [u, v]: es) {
    int lu = d.leader(u), lv = d.leader(v);
    if (lu == lv) {
      h[lu]++;
    } else {
      int l = d.merge(lu, lv);
      h[l] = max(h[lu], h[lv]) + 1;
    }
  }
  int ans = *max_element(all(h));
  cout << ans << '\n';
}