a,b=map(int,input().split())
if (a+1)//2>=b:
  print("YES")
else:
  print("NO") a,b=map(int,input().split()) a map(int,input().split()) map int input().split() ().split () input split b if (a+1)//2>=b:
  print("YES")
else:
  print("NO") (a+1)//2>=b (a+1)//2 a+1 a 1 2 b print("YES") print "YES" print("NO") print "NO" a,b=map(int,input().split()) map(int,input().split()) a b=map(int,input().split()) map(int,input().split()) b
a,b=map(int,input().split())
if (a+1)//2>=b:
  print("YES")
else:
  print("NO")