from collections import deque


N, M = map(int, input().split())
edges = [[] for _ in range(N)]

for _ in range(M):
    a, b = map(lambda x: x - 1, map(int, input().split()))
    edges[a].append(b)
    edges[b].append(a)

dist = [-1] * N
dist[0] = 0
dq = deque()
dq.append(0)

while dq:
    now = dq.popleft()
    for nxt in edges[now]:
        if dist[nxt] == -1:
            dist[nxt] = dist[now] + 1
            dq.append(nxt)
        else:
            if (dist[nxt] - dist[now]) % 2 == 0:
                exit(print("No"))

print("Yes")