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85
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 51
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 101

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;

/**
 *
 * @author Machis
 */
public class SerejaandSquares {

    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(bf.readLine());

        HashMap<Integer, Line> lines = new HashMap<Integer, Line>();
        for (int i = 0; i < n; i++) {
            StringTokenizer st = new StringTokenizer(bf.readLine());
            int x = Integer.parseInt(st.nextToken());
            if (lines.containsKey(x)) {
                TreeSet<Integer> points = lines.get(x).getPoints();
                points.add(Integer.parseInt(st.nextToken()));
            } else {
                Line l = new Line();
                l.add(Integer.parseInt(st.nextToken()));
                lines.put(x, l);
            }
        }

        int res = 0;
        Set<Integer> set = lines.keySet();
        Iterator<Integer> it1 = set.iterator();
        int last = 1;
        while (it1.hasNext() && last < lines.size()) {
            last++;
            int x = it1.next();
            Line l = lines.get(x);
            TreeSet<Integer> points = l.getPoints();
            Iterator<Integer> it = points.iterator();
            int cont = 1;
            while (it.hasNext() && cont < points.size()) {
                cont++;
                int actualPoint = it.next();
                int y1 = actualPoint;
                while (points.higher(y1) != null) {
                    int y2 = points.higher(y1);
                    int pos = x + y2 - actualPoint;
                    if (set.contains(pos)) {
                        TreeSet<Integer> t2 = lines.get(pos).getPoints();
                        if (t2.contains(y1) && t2.contains(y2)) {
                            res++;
                        }
                    }
                    y1 = y2;
                }
            }
        }

        System.out.println(res);
        /*for (int i = 0; i < lines.size(); i++) {
         Line l = lines.get(i);
         Iterator<Integer> it = l.getPoints().iterator();
         System.out.print("Line : " + i + " Points : ");
         while (it.hasNext()){
         System.out.print (it.next() + " ");
         }
         System.out.println();
         }*/
    }

}

class Line {

    TreeSet<Integer> points = new TreeSet<Integer>();

    public void add(int p) {
        points.add(p);
    }

    public TreeSet<Integer> getPoints() {
        return points;
    }
}