#include <bits/stdc++.h>
using namespace std;
int main() {
  unsigned long long n, k, t = 0;
  cin >> n >> k;
  if (n * (n - 1) / 2 < k) {
    cout << "Impossible" << endl;
    return 0;
  }
  for (unsigned long long i = 0; i < 2 * n; i++) {
    if (k >= t)
      k -= t, t++, cout << '(';
    else
      cout << ')', t--;
  }
}
