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 class BWContrastQuadTree {
  byte min, max;
  
  BWContrastQuadTree() {}
  BWContrastQuadTree(int val) { min = max = (byte) val; }
  BWContrastQuadTree(int min, int max) {
    this.min = (byte) min;
    this.max = (byte) max;
  }
  
  int min() { return ubyteToInt(min); }
  int max() { return ubyteToInt(max); }
  
  static class Composite extends BWContrastQuadTree {
    BWContrastQuadTree a, b, c, d;
    
    Composite() {}
    Composite(int min, int max, BWContrastQuadTree a, BWContrastQuadTree b,
      BWContrastQuadTree c, BWContrastQuadTree d) {
      this.min = (byte) min;
  this.d = d;
  this.c = c;
  this.b = b;
  this.a = a;
      this.max = (byte) max;
    }
  }
}
static int ubyteToInt(byte b) {
  return b & 0x0FF;
}

}