#include <bits/stdc++.h>
using namespace std;
long long n, k, s, cnt, val, kk, in, out;
char a[1600006];
int main() {
  cin >> n >> k;
  while (k >= 0 && cnt < n) {
    if (s + val <= k) {
      a[kk++] = '(';
      in++;
      k -= val;
      val++;
    } else {
      a[kk++] = ')';
      out++;
      val--;
      cnt++;
    }
    if (kk >= 1600006) {
      cout << "Impossible" << '\n';
      return 0;
    }
  }
  if (in != out)
    cout << "Impossible" << '\n';
  else
    cout << a << '\n';
  return 0;
}
