Defining Greedy Algorithm

please can someone point out error in my logic of solving delivery man problem from codechef.::

my code::

import java.util.*;

import java.lang.*;

import java.io.*;

class Codechef

{

public static Scanner sc=new Scanner(System.in);

public static void main (String[] args) throws java.lang.Exception

{

int no_order=100000,x=10000,y=10000;

int sum=0;