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 double usedHeapPercentage() {
  return doublePercent(usedMemory(), maxMemory());
}
static double doublePercent(double x, double y) {
  return doublePercentRatio(x, y);
}


static long usedMemory() {
  return Runtime.getRuntime().totalMemory()-Runtime.getRuntime().freeMemory();
}


static long maxMemory() {
  return Runtime.getRuntime().maxMemory();
}




static double doublePercentRatio(double x, double y) {
  return doubleRatio(x, y)*100;
}




static double doubleRatio(double x, double y) {
  return y == 0 ? 0 : x/y;
}



}