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' 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 (N+1)//2>=K:
  print('YES')
else:
  print('NO')