def f(n,k):
  #n%2==1 and k>n*(n-1)//2
  if k>(n**2-3)//2:
    return [-1]
  ans=[0]*n
  m=(n**2-3)//2-k+n//2+2
  for i in range(n//2):
    if n//2+2+i==m:
      ans[2*i]=n//2+2
    else:
      ans[2*i]=n//2+2+i
    ans[2*i+1]=i+1
  ans[n-1]=n//2+1
  ans[0]=m
  print(m)
  return ans

def f2(n,k):
  #n%2==0 and k>n*(n-1)//2
  if k>n**2//2-1:
    return [-1]
  ans=[0]*n
  m=n**2//2-k+n//2
  for i in range(n//2):
    if n//2+1+i==m:
      ans[2*i]=n//2+1
    else:
      ans[2*i]=n//2+1+i
    ans[2*i+1]=i+1
  ans[0]=m
  return ans

def g(n,k):
  #k<=n*(n-1)//2
  used=[1]*(n+1)
  used[n]=0
  k-=n-1
  ans=[n]
  L=n
  for i in range(n-2):
    if i%2==0:
      a=i//2+2
    else:
      a=n-(i+1)//2
    if k>=abs(L-a):
      k-=abs(L-a)
      L=a
      used[a]=0
      ans.append(a)
  ans2=[]
  for i in range(1,n):
    if used[i]:
      ans2.append(i)
  return ans2+ans
n,k=map(int,input().split())
if k<n-1:
  print(-1)
elif n%2==1:
  if k>n*(n-1)//2:
    print(*f(n,k))
  else:
    print(*g(n,k))
else:
  if k>n*(n-1)//2:
    print(*f2(n,k))
  else:
    print(*g(n,k))