#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}

int main() {
    fast_io();
    int n, m;
    cin >> n >> m;
    vector<vector<int>> g(n);
    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        a--, b--;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    vector<int> color(n, -1);
    deque<int> q;

    for (int i = 0; i < n; i++) {
        if (color[i] != -1) {
            continue;
        }
        q.push_back(i);
        color[i] = 0;
        while (!q.empty()) {
            int v = q.front();
            q.pop_front();
            for (int u : g[v]) {
                if (color[u] == -1) {
                    color[u] = 1 - color[v];
                    q.push_back(u);
                } else if (color[u] == color[v]) {
                    cout << "No" << endl;
                    return 0;
                }
            }
        }
    }
    cout << "Yes" << endl;
}