#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n, m; cin >> n >> m;
	scc_graph ss(n);
	vector<int>a(n), b(n);
	rep(i, m) {
		cin >> a[i] >> b[i]; a[i]--, b[i]--;
		ss.add_edge(a[i], b[i]);
	}
	auto vv = ss.scc();
	if (1 == vv.size()) {
		cout << 0 << endl;
		return 0;
	}
	dsu uf(n);
	int sz = vv.size();
	for (auto & v : vv) {
		auto top = v[0];
		for (auto e : v) uf.merge(e, top);
	}
	set<int>in, out;
	rep(i, m) {
		int l0 = uf.leader(a[i]);
		int l1 = uf.leader(b[i]);
		if (l0 == l1)continue;
		in.insert(l0);
		out.insert(l1);
	}
	int ans = sz - min(in.size(), out.size());
	cout << ans << endl;
	return 0;
}