#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

bool is_bipartite(vector<vector<int>> &g) {
  int n = g.size();
  enum Color {RED = 0, BLUE, NONE};
  vector<Color> color(n, NONE);
  for (int s = 0; s < n; s++) {
    if (color[s] != NONE) continue;
    color[s] = RED;
    vector<int> st {s};
    while (st.size()) {
      int u = st.back();
      st.pop_back();
      for (int v: g[u]) {
        if (color[v] == NONE) {
          color[v] = Color(color[u] ^ 1);
          st.push_back(v);
        } else if (color[u] == color[v]) return false;
      }
    }
  }
  return true;
}

int main() {
  int n, m; cin >> n >> m;
  vector<vector<int>> g(n);
  for (int i = 0; i < m; i++) {
    int u, v; cin >> u >> v;
    u--, v--;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  cout << (is_bipartite(g) ? "Yes": "No") << endl;
  return 0;
}