#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  long long k;
  cin >> n >> k;
  if (k > n * 1ll * (n - 1) / 2) {
    cout << "Impossible";
    return 0;
  }
  if (k == n * 1ll * (n - 1) / 2) {
    for (int i = 0; i < n; i++) {
      cout << "(";
    }
    for (int i = 0; i < n; i++) {
      cout << ")";
    }
    return 0;
  }
  for (int l = 1; l <= n; l++) {
    if (k >= l * 1ll * (l - 1) / 2 && k < l * 1ll * (l + 1) / 2) {
      int ost = k - l * 1ll * (l - 1) / 2;
      for (int i = 0; i < n - l - 1; i++) {
        cout << "()";
      }
      for (int i = 0; i < l; i++) {
        cout << "(";
      }
      for (int i = 0; i < l - ost; i++) {
        cout << ")";
      }
      cout << "()";
      for (int i = 0; i < ost; i++) {
        cout << ")";
      }
      return 0;
    }
  }
}
