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 {

public static void main(final String[] args) throws Exception {
  int a = 0, b = 0;
  long sum = 0;
  
  for (int _repeat_0 = 0; _repeat_0 < 300000; _repeat_0++)  {
    sum += twoIntsToLong(a, b);
    a ^= 5; b ^= 10;
  }
  
  System.out.println(sum);
}
static long twoIntsToLong(int a, int b) {
  return (((long) a) << 32) | (((long) b) & 0xFFFFFFFF);
}

}