#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  long long k;
  scanf("%d %lld", &n, &k);
  long long sum = 0;
  long long cnt = 0;
  long long nrNeeded = 0;
  while (sum < k) {
    if (sum + cnt <= k) {
      sum += cnt;
      ++cnt;
      nrNeeded += 2;
    } else
      cnt--;
    if (nrNeeded > 2 * n) {
      printf("Impossible");
      return 0;
    }
  }
  sum = 0, cnt = 0;
  while (sum < k) {
    if (sum + cnt <= k) {
      sum += cnt;
      ++cnt;
      printf("(");
    } else {
      cnt--;
      printf(")");
    }
  }
  while (cnt--) printf(")");
  n = n * 2 - nrNeeded;
  for (int i = 1; i <= n; i += 2) printf("()");
  return 0;
}
