from typing import List


def is_bipartite(G: List[List[int]]):
    n = len(G)
    C = [-1] * n
    for s in range(n):
        if C[s] != -1:
            continue

        C[s] = 0

        Q = [s]
        for u in Q:
            for v in G[u]:
                if C[v] == -1:
                    C[v] = C[u] ^ 1
                    Q.append(v)
                elif C[v] == C[u]:
                    return False
        
    return True


n, m = map(int, input().split())
G = [[] for _ in range(n)]
for _ in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    G[u].append(v)
    G[v].append(u)

if is_bipartite(G):
    print("Yes")
else:
    print("No")