#include <bits/stdc++.h>
using namespace std;
long long fun(long long x) {
  long long l = 0;
  long long r = 1000000007;
  long long mid;
  long long ret = 0;
  while (l <= r) {
    mid = (l + r) / 2;
    long long val;
    val = mid * (mid + 1) / 2;
    if (val <= x) {
      ret = mid;
      l = mid + 1;
    } else
      r = mid - 1;
  }
  return ret;
}
string ans;
int main() {
  long long n, k;
  cin >> n >> k;
  if (k > n * (n - 1) / 2) {
    cout << "Impossible" << endl;
    return 0;
  }
  ans = "";
  while (1) {
    long long d = fun(k);
    if (n == k && ans.length() || n < d + 1) break;
    for (long long i = 0; i <= d; i++) {
      ans += "(";
    }
    for (long long i = 0; i <= d; i++) {
      ans += ")";
    }
    n -= d + 1;
    k -= d * (d + 1) / 2;
  }
  if (n == 0 && k == 0) {
    cout << ans << endl;
    return 0;
  }
  if (k == 0) {
    for (int i = 0; i < n; i++) ans += "()";
    cout << ans << endl;
    return 0;
  }
  int i = 0;
  for (i = 0; i < k; i++) {
    cout << ans[i];
  }
  cout << "()";
  for (; i < ans.length(); i++) cout << ans[i];
  n--;
  for (int i = 0; i < n; i++) cout << "()";
  cout << endl;
  return 0;
}
