#include <bits/stdc++.h>
#define ALL(v) begin(v), end(v)

using i64 = int64_t;
auto C2(int x) { return i64{x - 1} * x / 2; }

int n;
i64 k;

auto main() -> int {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr), std::cout.tie(nullptr);

  std::cin >> n >> k;
  for (int c1 = n; ~c1; --c1) {
    i64 b = c1 - n, c = C2(c1 + 1) + C2(n - c1) - k;
    if (b * b < 4 * c) continue;
    int y = (std::sqrt(b * b - 4 * c) - b) / 2;
    if (c1 + y > n) y = (-std::sqrt(b * b - 4 * c) - b) / 2;
    if (i64{y} * y + y * b + c) continue;
    if (y < 0 || c1 + y > n) continue;
    for (int i = 0; i < c1; ++i) std::cout << "0 ";
    for (int i = 0; i < y; ++i) std::cout << !i << ' ';
    for (int i = 0; i < n - c1 - y; ++i) std::cout << !i << ' ';
    std::cout << '\n';
    exit(0);
  }
  std::cout << "-1\n";

  return 0;
}