#include <bits/stdc++.h>
using namespace std;
bool IsPrime(long long x) {
  bool isPrime = true;
  for (long long a = 2; a * a <= x; a++) {
    if (x % a == 0) return false;
  }
  return true;
}
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long n, k, sum = 0, d, p;
  cin >> n >> k;
  string s, string;
  if (n * (n - 1) / 2 < k) {
    cout << "Impossible";
    return 0;
  }
  for (long long i = 0; i < n; i++) {
    if (sum + i > k) {
      d = k - sum;
      p = i - 1;
      break;
    }
    s += '(';
    sum += i;
  }
  for (long long i = 0; i < s.length(); i++) {
    if (d == i - 1) string += ")(";
    string += s[i];
  }
  if (d == p) string += ")(";
  for (long long i = 0; i < s.length(); i++) {
    string += ')';
  }
  while (string.length() < 2 * n) {
    string += "()";
  }
  if (string.length() == 2 * n)
    cout << string;
  else
    cout << "Impossible";
}
