#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> a(m), b(m);
    vector<vector<int>> g(n);
    rep(i,m) {
        cin >> a[i] >> b[i];
        --a[i];--b[i];
        g[a[i]].push_back(b[i]);
        g[b[i]].push_back(a[i]);
    }
    vector<int> col(n,-1);
    auto dfs = [&](auto dfs, int u, int c, int p) -> bool  {
        col[u] = c;
        for(int v : g[u]) {
            if(v==p) continue;
            if(col[v]==c) return false;
            if(col[v]==-1 && !dfs(dfs, v, c^1, u)) return false;
        }
        return true;
    };
    rep(i,n) {
        if(col[i]==-1) {
            if(!dfs(dfs, i, 0,-1)){
                cout << "No" << endl;
                return 0;
            }
        }
    }
    cout << "Yes" << endl;
    return 0;
}