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