#C問題:鉄道同好会


N,M = map(int,input().split(" "))

array = [[False]*N for i in range(N)]
end = 0

for i in range(M):
	Sa,Sb = map(int,input().split(" "))
	array[Sa][Sb] = True
	array[Sb][Sa] = True

for i in range(N):
	num = array[i].count(True)
	if num%2 == 1:
		end += 1
		if end >= 3:
			print("No")
			exit(0)

print("Yes")