n,k = map(int,input().split())

s = -(-n//2)

if s>=k :
	print("YES")
else:
	print("NO") n,k = map(int,input().split()) n map(int,input().split()) map int input().split() ().split () input split k s = -(-n//2) s -(-n//2) -n//2 -n n 2 if s>=k :
	print("YES")
else:
	print("NO") s>=k s k print("YES") print "YES" print("NO") print "NO" s = -(-n//2) -(-n//2) s n,k = map(int,input().split()) map(int,input().split()) n k = map(int,input().split()) map(int,input().split()) k
n,k = map(int,input().split())

s = -(-n//2)

if s>=k :
	print("YES")
else:
	print("NO")