n,k=map(int,input().split())
L=list(map(int,input().split()))
from collections import defaultdict
d=defaultdict(int)
for e in L:
	d[e]+=1
Max=0
for k,v in d.items():
	if k!=0:
		Max=max(Max,v)
		
if k<=Max+d[0]:
	print("Yes")
else:
	print("No")