#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using ii = pair<int, int>;
const int oo = 0x3f3f3f3f;
const ll OO = ll(oo) * oo;
const int N = 600005;
char s[N];
int(((((main)))))() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  ll k;
  cin >> n >> k;
  n <<= 1;
  int p = 0;
  ll sum = 0;
  ll depth = 0;
  while (p < n) {
    if (sum + depth <= k && p + depth + 1 < n) {
      s[p++] = '(';
      sum += depth;
      depth++;
    } else {
      s[p++] = ')';
      depth--;
    }
  }
  if (sum < k) {
    cout << "Impossible" << '\n';
    return 0;
  }
  cout << s << '\n';
  return 0;
}
