dqqw

Sum

import java.util.*;
public class Sum
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        TreeSet<Long> ts = new TreeSet<>();
        ArrayList<Long> al1 = new ArrayList<>();
        ArrayList<Long> al2 = new ArrayList<>();
        HashSet<Long> hs = new HashSet<>();
        
        long x=0;long duplicate=0;
        while(sc.hasNextInt())
        {
            x = sc.nextInt();
            if(hs.contains(x) == false)
            {
            
            al1.add(-10000-x);
            al2.add(10000-x);
            ts.add(x);
            hs.add(x);
            }
            else duplicate++;
            
        }
        long size = 0;
        for(int i=0;i<al1.size();i++)
        {
            long a = al1.get(i);
            long b = al2.get(i);
            size += ts.subSet(a,true,b,true).size();
        }
        System.out.println(size - duplicate);
        
        
    }
}