#include <bits/stdc++.h>
using namespace std;
long long n, k, bal, now;
int main() {
  cin >> n >> k;
  bal = 0;
  now = 0;
  if (n * (n - 1) / 2 < k) {
    cout << "Impossible";
    return 0;
  }
  while (now < 2 * n) {
    if (bal <= k) {
      k -= bal;
      bal++;
      cout << "(";
    } else {
      bal--;
      cout << ")";
    }
    now++;
  }
  return 0;
}
