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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3 5
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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
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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
6 4
0 2
9 9
4 8
7 2
8 0
9 4
0 10
4 5
9 8
10 3
8 7
8 5
7 7
6 7
5 7
5 4
8 4
3 2
7 3
9 0
0 8
0 5
3 9
2 10
7 1
4 3
1 10
3 0
5 9
10 1
6 1
4 10
1 0
2 1
2 0
3 8
10 7
7 4
0 9
1 1
1 8
8 3
5 2
6 3
4 2
 71
5 3
1 10
10 3
5 2
3 5
10 9
10 2
1 5
9 5
8 9
2 3
2 6
8 4
6 3
0 2
9 4
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3 7
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4 8
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0 7
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9 3
7 6
6 7
4 4
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2 9
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1 6
10 8
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
6 10
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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3 8
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5 4
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2 0
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9 0
9 9
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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
0 2
0 8
9 10
0 5
4 10
7 4
1 8
2 7
10 3
9 3
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6 1
8 3
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;
inline void pisz(int n) { printf("%d\n", n); }
template <typename T, typename TT>
ostream& operator<<(ostream& s, pair<T, TT> t) {
  return s << "(" << t.first << "," << t.second << ")";
}
template <typename T>
ostream& operator<<(ostream& s, vector<T> t) {
  for (int(i) = 0; (i) < (((int)((t).size()))); ++(i)) s << t[i] << " ";
  return s;
}
vector<int> p[100007], q[100007];
long long ha(int x, int y) { return 100001LL * x + y; }
int main() {
  int res = 0;
  int(n);
  scanf("%d", &(n));
  unordered_set<long long> pts;
  for (int(i) = 0; (i) < (n); ++(i)) {
    int(x), (y);
    scanf("%d %d", &(x), &(y));
    pts.insert(ha(x, y));
    p[x].push_back(y);
  }
  const int SQ = sqrt(n);
  for (int(x) = (1); (x) <= (100000); ++x) {
    sort(p[x].begin(), p[x].end());
    if (((int)((p[x]).size())) > SQ) {
      for (__typeof(p[x].begin()) y = p[x].begin(); y != p[x].end(); y++)
        q[*y].push_back(x);
    } else {
      for (int(i) = 0; (i) < (((int)((p[x]).size()))); ++(i))
        for (int(j) = (i + 1); (j) <= (((int)((p[x]).size())) - 1); ++j) {
          int y1 = p[x][i], y2 = p[x][j];
          int d = y2 - y1;
          if (pts.count(ha(x - d, y1)) && pts.count(ha(x - d, y2))) ++res;
          if (pts.count(ha(x + d, y1)) && pts.count(ha(x + d, y2))) ++res;
        }
      for (__typeof(p[x].begin()) y = p[x].begin(); y != p[x].end(); y++)
        pts.erase(ha(x, *y));
    }
  }
  for (int(y) = (1); (y) <= (100000); ++y) {
    sort(q[y].begin(), q[y].end());
    for (int(i) = 0; (i) < (((int)((q[y]).size()))); ++(i))
      for (int(j) = (i + 1); (j) <= (((int)((q[y]).size())) - 1); ++j) {
        int x1 = q[y][i], x2 = q[y][j];
        int d = x2 - x1;
        if (pts.count(ha(x1, y - d)) && pts.count(ha(x2, y - d))) ++res;
        if (pts.count(ha(x1, y + d)) && pts.count(ha(x2, y + d))) ++res;
      }
    for (__typeof(q[y].begin()) x = q[y].begin(); x != q[y].end(); x++)
      pts.erase(ha(*x, y));
  }
  pisz(res);
}
