from collections import defaultdict
N,K=list(map(int,input().split()))
A=list(map(int,input().split()))

d=defaultdict(int)

for a in A:d[a]+=1
# print(d)
for _,v in d.items():
    if v==K or v+1==K:
        print("Yes")
        exit(0)
print("No")