#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <deque>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cctype>
#include <cstring>
#include <ctime>
#include <iterator>
#include <bitset>
#include <numeric>
#include <list>
#include <iomanip>
#include <cassert>
#include <array>
#include <tuple>
#include <initializer_list>
#include <unordered_set>
#include <unordered_map>
#include <forward_list>
using namespace std;
using ll = long long;
#define rep(cur,k) for (int cur = 0; cur < (int)(k); cur++)
#define all(cnt) begin(cnt), end(cnt)

const int INF = 1e9;

int n, m;
vector<vector<int>> g;
vector<int> dist;
vector<set<int>> s;

int main() {
    while (cin >> n >> m) {
        g.assign(n, {});
        for (int i = 0; i < m; i++) {
            int a, b;
            cin >> a >> b;
            --a; --b;
            g[a].emplace_back(b);
            g[b].emplace_back(a);
        }
        queue<int> q;
        q.push(0);
        dist.assign(n, INF);
        dist[0] = 0;
        while (q.size()) {
            int cur = q.front();
            q.pop();
            for (auto &dst : g[cur]) {
                if (dist[dst] == INF) {
                    q.push(dst);
                    dist[dst] = dist[cur] + 1;
                }
            }
        }
        s.assign(n, {});
        vector<int> acc(n, false);
        for (int i = 0; i < n; i++) {
            for (auto j : g[i]) {
                if (dist[j] == 1) {
                    acc[i] = true;
                    s[i].insert(j);
                }
            }
            while (s[i].size() > 4) {
                auto it = s[i].begin();
                ++it; ++it;
                s[i].erase(it);
            }
        }

        bool ok = false;
        for (int i = 0; i < n; i++) {
            for (auto &j : g[i]) {
                if (acc[i] && acc[j]){
                    auto S = s[i];
                    for (auto k : s[j]) S.insert(k);
                    S.erase(i);
                    S.erase(j);
                    if (S.size() >= 2) ok = true;
                }
            }
        }
        cout << (ok ? "YES" : "NO") << endl;
    }
}