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

if int((n+1)/2)>=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 if int((n+1)/2)>=k:
  print("YES")
else:
  print("NO") int((n+1)/2)>=k int((n+1)/2) int (n+1)/2 n+1 n 1 2 k print("YES") print "YES" print("NO") print "NO" 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())

if int((n+1)/2)>=k:
  print("YES")
else:
  print("NO")
