81
9 4
6 8
6 4
4 6
4 8
9 10
0 2
5 4
8 9
7 7
10 5
4 4
7 8
3 7
2 1
5 5
2 7
8 6
2 8
10 7
5 8
0 10
10 0
4 9
4 2
10 3
6 6
3 8
5 3
8 8
10 9
1 1
0 9
8 1
1 8
0 7
10 4
3 6
7 6
1 9
8 3
8 10
4 5
3 4
7 5
2 0
0 6
2 4
7 4
6 3
1 6
10 8
1 5
6 5
0 0
9 0
7 3
3 2
2 6
4 0
8 7
10 10
3 0
0 5
3 9
5 1
6 0
1 4
0 1
1 2
6 2
9 7
6 10
1 3
1 7
2 5
5 10
10 2
5 6
6 7
2 3
 1
0 0
 3
5 1
4 1
2 6
 54
0 8
3 2
9 3
7 2
8 2
2 8
10 10
7 6
1 1
9 7
4 0
6 10
10 1
10 8
5 1
0 4
7 10
3 6
0 5
4 3
3 0
5 10
6 9
5 4
6 6
8 5
0 7
5 8
1 2
2 2
9 4
2 4
0 10
5 9
10 9
7 9
9 9
2 5
4 10
8 9
7 7
5 2
6 5
4 1
10 6
6 3
9 6
0 9
7 3
7 5
8 4
1 3
0 3
2 10
 49
2 9
7 0
8 0
10 3
2 10
6 10
6 2
9 7
1 9
4 6
5 4
1 0
9 4
6 9
5 6
7 9
10 10
8 2
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0 8
4 4
5 7
0 0
9 1
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1 7
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3 5
8 5
6 4
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2 7
4 1
10 2
2 4
8 4
0 9
3 4
4 9
7 7
10 9
2 3
7 2
5 8
4 7
10 8
7 6
1 8
 72
8 2
2 4
3 5
9 10
7 6
1 5
0 0
3 3
1 6
7 10
8 8
7 9
6 0
3 6
9 3
8 1
3 4
3 7
0 7
10 8
2 6
6 8
0 6
5 6
6 6
6 5
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9 9
4 8
7 2
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0 10
4 5
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8 7
8 5
7 7
6 7
5 7
5 4
8 4
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7 1
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10 1
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1 0
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3 8
10 7
7 4
0 9
1 1
1 8
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 71
5 3
1 10
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5 2
3 5
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10 2
1 5
9 5
8 9
2 3
2 6
8 4
6 3
0 2
9 4
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7 7
10 0
4 0
1 4
1 6
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6 1
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3 7
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4 8
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9 3
7 6
6 7
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 1
100000 100000
 87
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1 0
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1 6
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9 10
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1 8
2 7
10 3
9 3
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6 1
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5 1
3 10
10 4
2 10
4 5
5 7
7 9
1 7
8 6
1 1
7 2
7 5
5 5
1 4
6 8
6 3

85
 0
 0
 14
 11
 51
 40
 0
 0
 101

import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.Set;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.util.HashSet;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		FastScanner in = new FastScanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskD solver = new TaskD();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskD {
    public void solve(int testNumber, FastScanner in, PrintWriter out) {
		int n = in.nextInt();
		int M = 100000;
		int[] numByX = new int[M + 1];
		int[] numByY = new int[M + 1];
		int[] firstByX = new int[M + 1];
		int[] nextByX = new int[n];
		int[] firstByY = new int[M + 1];
		int[] nextByY = new int[n];
		Arrays.fill(firstByX, -1);
		Arrays.fill(firstByY, -1);
		Set<Long> all = new HashSet<Long>();
		int[] x = new int[n];
		int[] y = new int[n];
		for (int i = 0; i < n; i++) {
			x[i] = in.nextInt();
			y[i] = in.nextInt();
			++numByX[x[i]];
			++numByY[y[i]];
			nextByX[i] = firstByX[x[i]];
			firstByX[x[i]] = i;
			nextByY[i] = firstByY[y[i]];
			firstByY[y[i]] = i;
			long key = x[i] * (long)(M + 1) + y[i];
			all.add(key);
		}
		int ans = 0;
		for (int i = 0; i < n; i++) {
			int first;
			int[] next;
			if (numByX[x[i]] < numByY[y[i]]) {
				first = firstByX[x[i]];
				next = nextByX;
			} else {
				first = firstByY[y[i]];
				next = nextByY;
			}
			int x1 = x[i];
			int y1 = y[i];
			for (int j = first; j >= 0; j = next[j]) {
				int x2 = x[j];
				int y2 = y[j];
				if (x1 > x2) continue;
				if (y1 > y2) continue;
				int x3, y3, x4, y4;
				int side = (x2 - x1) + (y2 - y1);
				if (side == 0) continue;
				if (x1 == x2) {
					x3 = x1 + side;
					y3 = y1;
					x4 = x2 + side;
					y4 = y2;
				} else {
					x3 = x1;
					y3 = y1 + side;
					x4 = x2;
					y4 = y2 + side;
				}
				long key3 = x3 * (long)(M + 1) + y3;
				long key4 = x4 * (long)(M + 1) + y4;
				if (all.contains(key3) && all.contains(key4)) {
					++ans;
				}
			}
		}
		out.println(ans);
    }
}

class FastScanner {

	private BufferedReader in;
	private StringTokenizer st;

	public FastScanner(InputStream stream) {
		in = new BufferedReader(new InputStreamReader(stream));
	}

	public String next() {
		while (st == null || !st.hasMoreTokens()) {
			try {
				st = new StringTokenizer(in.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return st.nextToken();
	}

	public int nextInt() {
		return Integer.parseInt(next());
	}

	public long nextLong() {
		return Long.parseLong(next());
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}

}

