#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  long long n, k;
  cin >> n >> k;
  if (n == 1) {
    if (k == 0)
      cout << "()" << endl;
    else
      cout << "Impossible" << endl;
    return 0;
  }
  if (k > n * (n - 1) / 2) {
    cout << "Impossible" << endl;
    return 0;
  }
  map<long long, int> m;
  long long sum = 0;
  for (int i = 0; i < n; i++) {
    m[i] = 1;
    sum += i;
  }
  while (sum > k) {
    auto it = m.end();
    --it;
    long long num = it->first, cnt = it->second;
    if (sum - cnt <= k) {
      long long diff = sum - k;
      m[num] -= diff;
      m[num - 1] += diff;
      sum -= diff;
      break;
    }
    m.erase(num);
    m[num - 1] += cnt;
    sum -= cnt;
  }
  auto it = m.end();
  --it;
  int maxNum = it->first;
  string s;
  for (int i = 0; i < m.size() - 1; i++) {
    s += '(';
  }
  for (int i = maxNum; i >= 1; i--) {
    int M = m[i];
    if (i != maxNum) M--;
    while (M--) {
      s += "()";
      k -= i;
    }
    s += ')';
    k -= i - 1;
  }
  for (int i = 0; i < m[0] - 1; i++) {
    s += "()";
  }
  assert(k == 0);
  assert(s.size() == n * 2);
  cout << s << endl;
}
