import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import java.util.function.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.imageio.*;
import java.math.*;
class main {

static Throwable exceptionForTimeoutedThread(Thread thread) {
  var stackTrace = thread.getStackTrace();  
  var cause = new ThrowableWithCustomStackTrace("Still calculating", stackTrace);
  return cause;
}
static class ThrowableWithCustomStackTrace extends Throwable {
  ThrowableWithCustomStackTrace(String msg, StackTraceElement[] stackTrace) {
    super(msg, null, false, true);
    setStackTrace(stackTrace);
  }
}

}