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 <A, B> Map<A, B> mapPlus_noOverwrite(Map<A, B> m, Object... data) {
  m = cloneMap(m);
  litmap_impl_noOverwrite(m, data);
  return m;
}
static <A, B> Map<A, B> cloneMap(Map<A, B> map) {
  if (map == null) return new HashMap();
  // assume mutex is equal to collection
  synchronized(map) {
    return map instanceof TreeMap ? new TreeMap((TreeMap) map) // copies comparator
      : map instanceof LinkedHashMap ? new LinkedHashMap(map)
      : new HashMap(map);
  }
}
static void litmap_impl_noOverwrite(Map map, Object... x) {
  if (x != null) for (int i = 0; i < x.length-1; i += 2)
    putIfNotThere(map, x[i], x[i+1]);
}


static <A, B> void putIfNotThere(Map<A, B> map, A key, B value) {
  if (map != null && key != null && value != null && !map.containsKey(key))
    map.put(key, value);
}

}