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