n,m=map(int,input().split())
graph=[[] for _ in range(n)]
for _ in range(m):
    u,v=map(lambda x:int(x)-1,input().split())
    graph[u].append(v)
    graph[v].append(u)
    
color=[0]*n
def bipartite(v,c):
    res=[0,0]
    color[v]=c
    if c==1:res[0]+=1
    else:res[1]+=1
    
    for nv in graph[v]:
        if color[nv]==c:return [-1,-1]
        elif color[nv]==-c:continue
        else:
            black,white=bipartite(nv,-c)
            if black==-1 or white==-1:return [-1,-1]
            res[0]+=black
            res[1]+=white
    
    return res

print('Yes' if bipartite(0,1)!=[-1,-1] else 'No')