#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    //aとbは偶奇が異なっていないといけない
    int N, M, a, b;
    cin >> N >> M;
    vector<vector<int>> E(N+1);
    vector<int> color(N+1, -1);

    for (int i=1; i<=M; i++){
        cin >> a >> b;
        E[a].push_back(b);
        E[b].push_back(a);
    }

    auto dfs=[&](auto self, int from)->void{
        for (auto to : E[from]){
            if (color[to] != -1){
                if (color[to] == color[from]){
                    cout << "No" << endl;
                    exit(0);
                }
                continue;
            }
            color[to] = 1 - color[from];
            self(self, to);
        }
    };

    color[1] = 0;
    dfs(dfs, 1);

    cout << "Yes" << endl;

    return 0;
}