#include <bits/stdc++.h>
using namespace std;
const long long N = 2e6 + 5, MOD = 1e9 + 7, MAXN = 1e5 + 10, LG = 20, M = 1e7,
                P = 727, SQ = 330 + 5;
const long long inf = 2e18 + 10;
int32_t main() {
  long long n, k;
  cin >> n >> k;
  long long curr = 0, ans = 0;
  string ret = "";
  for (long long i = 1; i <= n; i++) {
    while (curr && curr + ans > k) {
      curr--;
      ret += ')';
    }
    ans += curr;
    ret += '(';
    curr++;
    if (i == n) {
      while (curr) {
        curr--;
        ret += ')';
      }
    }
  }
  if (ans == k) return cout << ret, 0;
  return cout << "Impossible", 0;
}
