n,k=map(int,input().split())
if k*2<=n+n%2:
  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 k*2<=n+n%2:
  print("YES")
else:
  print("NO") k*2<=n+n%2 k*2 k 2 n+n%2 n n%2 n 2 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 k*2<=n+n%2:
  print("YES")
else:
  print("NO")