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
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8 7
10 10
3 0
0 5
3 9
5 1
6 0
1 4
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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
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2 6
 54
0 8
3 2
9 3
7 2
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10 10
7 6
1 1
9 7
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3 6
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6 9
5 4
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9 4
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5 9
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7 9
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 49
2 9
7 0
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6 10
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9 7
1 9
4 6
5 4
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9 4
6 9
5 6
7 9
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0 8
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5 7
0 0
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3 5
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6 4
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 72
8 2
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7 6
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8 8
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3 6
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2 6
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0 6
5 6
6 6
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 71
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 1
100000 100000
 87
5 10
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1 0
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1 6
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3 10
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2 10
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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;
int n, res = 0;
vector<vector<int>> xy, yx;
vector<unordered_set<int>> xyh, yxh;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cin >> n;
  xy.assign(1e5 + 1, vector<int>());
  yx.assign(1e5 + 1, vector<int>());
  xyh.assign(1e5 + 1, unordered_set<int>());
  yxh.assign(1e5 + 1, unordered_set<int>());
  for (int i = 0; i < n; ++i) {
    int x, y;
    cin >> x >> y;
    xy[x].push_back(y);
    yx[y].push_back(x);
    xyh[x].insert(y);
    yxh[y].insert(x);
  }
  for (int i = 0; i <= 1e5; ++i) {
    sort(xy[i].begin(), xy[i].end());
    for (int j = 0; j < (int)xy[i].size(); ++j) {
      if ((int)xy[i].size() - i - 1 < (int)yx[xy[i][j]].size()) {
        for (int k = j + 1; k < (int)xy[i].size(); ++k) {
          int sz = xy[i][k] - xy[i][j];
          if (yxh[xy[i][j]].find(i + sz) != yxh[xy[i][j]].end() &&
              yxh[xy[i][k]].find(i + sz) != yxh[xy[i][k]].end()) {
            res++;
          }
        }
      } else {
        for (int k = 0; k < (int)yx[xy[i][j]].size(); ++k) {
          int sz = yx[xy[i][j]][k] - i;
          if (xyh[i].find(xy[i][j] + sz) != xyh[i].end() &&
              xyh[yx[xy[i][j]][k]].find(xy[i][j] + sz) !=
                  xyh[yx[xy[i][j]][k]].end()) {
            res++;
          }
        }
      }
    }
  }
  cout << res;
  return 0;
}
