#include <bits/stdc++.h>
using namespace std;
int64_t n, k, sum = 0;
int main() {
  cin >> n >> k;
  if (n * (n - 1) / 2 < k) {
    cout << "Impossible";
    return 0;
  }
  int tmp = 0;
  for (int i = 1; i <= 2 * n; i++)
    if (tmp <= k) {
      k -= tmp++;
      cout << '(';
    } else {
      tmp--;
      cout << ')';
    }
}
