n,k = map(int,input().split())
if n%2 == 0:
  if n//2 >= k:
    print("YES")
  else:
    print("NO")
else:
  if n//2+1 >= 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%2 == 0:
  if n//2 >= k:
    print("YES")
  else:
    print("NO")
else:
  if n//2+1 >= k:
    print("YES")
  else:
    print("NO") n%2 == 0 n%2 n 2 0 if n//2 >= k:
    print("YES")
  else:
    print("NO") n//2 >= k n//2 n 2 k print("YES") print "YES" print("NO") print "NO" if n//2+1 >= k:
    print("YES")
  else:
    print("NO") n//2+1 >= k n//2+1 n//2 n 2 1 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%2 == 0:
  if n//2 >= k:
    print("YES")
  else:
    print("NO")
else:
  if n//2+1 >= k:
    print("YES")
  else:
    print("NO")