#include <deque>
#include <iostream>
#include <utility>
#include <vector>

#include <atcoder/modint>

using mint = atcoder::modint998244353;

std::vector<mint> naive(int n, const std::vector<std::pair<int, int>>& edges) {
    std::vector<std::vector<int>> g(n);
    for (const auto& [u, v] : edges) {
        g[u].push_back(v);
        g[v].push_back(u);
    }
    std::vector<mint> f(n, 1);
    for (int x = 0; x < n; ++x) {
        std::vector<int8_t> vis(n);
        vis[x] = true;
        std::deque<int> dq{ x };
        while (dq.size()) {
            int u = dq.front();
            dq.pop_front();
            for (int v : g[u]) if (not vis[v]) {
                vis[v] = true;
                if (v < x) {
                    dq.push_back(v);
                }
                if (v > x) {
                    f[v] += f[x];
                }
            }
        }
    }
    return f;
}

#include <atcoder/dsu>
#include <algorithm>
#include <set>

std::vector<mint> solve(int n, const std::vector<std::pair<int, int>>& edges) {
    atcoder::dsu uf(n);

    std::vector<std::vector<int>> ts(n);
    for (const auto& [u, v] : edges) {
        ts[u].push_back(v);
    }

    std::vector<std::set<int>> neighbors(n);
    std::vector<mint> lazy(n);

    for (const auto& [u, v] : edges) {
        neighbors[v].insert(u);
    }

    std::vector<mint> f(n, 1);
    for (int s = 0; s < n; ++s) {
        std::set<int> cmps_set;
        for (int t : ts[s]) {
            cmps_set.insert(uf.leader(t));
        }
        std::vector<int> cmps(cmps_set.begin(), cmps_set.end());
        for (int t : cmps) {
            uf.merge(s, t);
            f[s] += lazy[t];
            lazy[s] += lazy[t];
        }
        lazy[s] += f[s];
        if (cmps.empty()) continue;

        auto argmax = *std::max_element(cmps.begin(), cmps.end(), [&](int i, int j) { return neighbors[i].size() < neighbors[j].size(); });
        for (int t : cmps) if (t != argmax) {
            lazy[s] -= lazy[t];
        }

        if (neighbors[argmax].size() < neighbors[s].size()) {
            argmax = s;
        }
        for (int t : cmps) if (t != argmax) {
            for (int neighbor : neighbors[t]) if (neighbor != s) {
                f[neighbor] += lazy[t];
                if (neighbors[argmax].count(neighbor)) {
                    continue;
                }
                f[neighbor] -= lazy[argmax];
                neighbors[argmax].insert(neighbor);
            }
        }
        if (s != argmax) {
            for (int neighbor : neighbors[s]) if (neighbor != s) {
                if (neighbors[argmax].count(neighbor)) {
                    continue;
                }
                f[neighbor] -= lazy[argmax];
                neighbors[argmax].insert(neighbor);
            }
        }
        int root = uf.leader(s);
        std::swap(lazy[root], lazy[s]);
        std::swap(neighbors[root], neighbors[argmax]);
        neighbors[root].erase(s);
    }
    return f;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int n, m;
    std::cin >> n >> m;

    std::vector<std::pair<int, int>> edges(m);
    for (auto& [u, v] : edges) {
        std::cin >> u >> v;
        --u, --v;
        if (u < v) {
            std::swap(u, v);
        }
    }

    mint ans = 0;
    for (const auto& e : solve(n, edges)) {
        ans += e;
    }
    std::cout << ans.val() << std::endl;
}