package chelper;

import java.util.ArrayList;
import java.util.List;

import io.InputReader;
import io.OutputWriter;
import misc.SimpleSavingChelperSolution;


public class C extends SimpleSavingChelperSolution {

  public void solve(int testNumber, InputReader in, OutputWriter out) {
    wrapSolve(testNumber, in, out);
  }

  @Override
  public void solve(int testNumber) {
    int n = in.nextInt();
    long k = in.nextLong();

    long left = k;
    StringBuilder sb = new StringBuilder();

    long current = -1;

    for (int i = 0; i < n; i++) {
      if (current + 1 <= left) {
        current++;
        left -= current;
        sb.append('(');

        continue;
      }

      while (current + 1 > left) {
        sb.append(')');
        current--;
      }

      current++;
      left -= current;
      sb.append('(');
    }

    while (current + 1 > 0) {
      sb.append(')');
      current--;
    }

    if (left > 0) {
      out.println("Impossible");
      return;
    }

    out.println(sb.toString());
  }
}