n,k=map(int,input().split())
if (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 (n+1)/2>=k:
  print('YES')
else:
  print('NO') (n+1)/2>=k (n+1)/2 n+1 n 1 2 k print('YES') print 'YES' print('NO') print 'NO' k=map(int,input().split()) map(int,input().split()) k n,k=map(int,input().split()) map(int,input().split()) n
n,k=map(int,input().split())
if (n+1)/2>=k:
  print('YES')
else:
  print('NO')