#include <bits/stdc++.h>
using namespace std;
void brackets() {
  long long n, k;
  string impossible = "Impossible";
  string s;
  cin >> n >> k;
  if (n * (n - 1) / 2 < k) {
    cout << impossible << endl;
    return;
  }
  long long sum = 0;
  int p = 0;
  for (int i = 0; i < 2 * n; ++i) {
    if (sum + p <= k) {
      s += "(";
      sum += p;
      p++;
    } else {
      s += ")";
      p--;
    }
  }
  if (p == 0)
    cout << s << endl;
  else
    cout << impossible << endl;
}
int main() {
  brackets();
  return 0;
}
