#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

std::vector<int> is_bipartite(const std::vector<std::vector<int>>& graph) {
  const int n = graph.size();
  std::vector<int> color(n, -1);
  const auto dfs = [&graph, &color](auto dfs, const int ver, const int c)
      -> bool {
    color[ver] = c;
    for (const int e : graph[ver]) {
      if (color[e] == c
          || (color[e] == -1 && !dfs(dfs, e, c ^ 1))) {
        return false;
      }
    }
    return true;
  };
  for (int i = 0; i < n; ++i) {
    if (color[i] == -1 && !dfs(dfs, i, 0)) return std::vector<int>{};
  }
  return color;
}

int main() {
  int n, m; cin >> n >> m;
  vector<vector<int>> graph(n);
  while (m--) {
    int a, b; cin >> a >> b; --a; --b;
    graph[a].emplace_back(b);
    graph[b].emplace_back(a);
  }
  cout << (is_bipartite(graph).empty() ? "No\n" : "Yes\n");
  return 0;
}