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> void putUnlessZero(Map<A, Integer> map, A key, int value) {
  if (map != null && key != null && value != 0) map.put(key, value);
}

static <A> void putUnlessZero(Map<A, Double> map, A key, double value) {
  if (map != null && key != null && value != 0) map.put(key, value);
}}