n,k = map(int,input().split())
if n / 2 + 1 > k and not (n == 2 and k == 2):
    print("YES")
elif n == 2 and k == 2:
    print("NO")
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 + 1 > k and not (n == 2 and k == 2):
    print("YES")
elif n == 2 and k == 2:
    print("NO")
else:
    print("NO") n / 2 + 1 > k and not (n == 2 and k == 2) n / 2 + 1 > k n / 2 + 1 n / 2 n 2 1 k not (n == 2 and k == 2) n == 2 and k == 2 n == 2 n 2 k == 2 k 2 print("YES") print "YES" elif n == 2 and k == 2:
    print("NO") n == 2 and k == 2 n == 2 n 2 k == 2 k 2 print("NO") print "NO" 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 + 1 > k and not (n == 2 and k == 2):
    print("YES")
elif n == 2 and k == 2:
    print("NO")
else:
    print("NO")