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 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 javax.imageio.*;
import java.math.*;
class main {

static com.sun.management.ThreadMXBean advancedThreadMXBean_cache;
static com.sun.management.ThreadMXBean advancedThreadMXBean() { if (advancedThreadMXBean_cache == null) advancedThreadMXBean_cache = advancedThreadMXBean_load(); return advancedThreadMXBean_cache; }

static com.sun.management.ThreadMXBean advancedThreadMXBean_load() {
  return optCast(com.sun.management.ThreadMXBean.class, threadMXBean());
}
static <A> A optCast(Class<A> c, Object o) {
  return isInstance(c, o) ? (A) o : null;
}

static ThreadMXBean threadMXBean() {
  return ManagementFactory.getThreadMXBean();
}



static boolean isInstance(Class type, Object arg) {
  return type.isInstance(arg);
}


}