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

#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
int x[maxn], y[maxn];
vector<int> xs[maxn], ys[maxn];
vector<pair<int, int> > al;
inline bool isin(int p, int q) {
  int pos = lower_bound(al.begin(), al.end(), make_pair(p, q)) - al.begin();
  return (pos < al.size() && al[pos] == make_pair(p, q));
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i];
    xs[x[i]].push_back(y[i]);
    ys[y[i]].push_back(x[i]);
    al.push_back({x[i], y[i]});
  }
  sort(al.begin(), al.end());
  for (int i = 0; i < maxn; i++)
    sort(xs[i].begin(), xs[i].end()), sort(ys[i].begin(), ys[i].end());
  int ans = 0;
  for (int i = 0; i < n; i++) {
    int p = x[i], q = y[i];
    int t1 = lower_bound(xs[p].begin(), xs[p].end(), q) - xs[p].begin();
    int t2 = lower_bound(ys[q].begin(), ys[q].end(), p) - ys[q].begin();
    int len1 = xs[p].size() - t1;
    int len2 = ys[q].size() - t2;
    if (len1 < len2) {
      for (int j = t1 + 1; j < xs[p].size(); j++) {
        int q2 = xs[p][j];
        ans += (isin(p + q2 - q, q) && isin(p + q2 - q, q2));
      }
    } else {
      for (int j = t2 + 1; j < ys[q].size(); j++) {
        int p2 = ys[q][j];
        ans += (isin(p, q + p2 - p) && isin(p2, q + p2 - p));
      }
    }
  }
  cout << ans << '\n';
}
