#include <bits/stdc++.h>
using namespace std;
void Weapons19() {
  long long int n, k;
  cin >> n >> k;
  string s;
  long long int t = 0, req = k, c = 0, o = 0;
  for (long long int i = 0; i < n; i++) {
    if (t <= req) {
      req -= t;
      o++;
      s += '(';
      t++;
    } else {
      s += ')';
      c++;
      i--;
      t--;
    }
  }
  if (req > 0) {
    cout << "Impossible";
    return;
  }
  while (s.size() != n * 2) s += ')';
  cout << s;
}
int32_t main() {
  cout << fixed << setprecision(2);
  cin.sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  Weapons19();
}
