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