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
3 10
0 8
4 4
5 7
0 0
9 1
0 7
2 0
1 7
10 0
3 5
8 5
6 4
0 4
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
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
2 0
7 7
10 0
4 0
1 4
1 6
4 5
6 1
8 2
0 0
0 1
3 7
3 10
4 8
4 6
3 8
1 0
9 10
9 9
6 5
7 1
10 1
6 6
3 4
4 3
4 2
4 10
9 6
7 3
6 8
5 5
4 9
0 7
0 9
8 10
2 7
1 7
7 2
5 8
1 2
3 6
10 8
0 8
3 1
1 3
9 3
7 6
6 7
4 4
0 3
2 2
5 10
2 9
0 5
7 0
 3
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
6 9
6 4
3 2
10 10
0 4
8 9
8 8
4 8
10 2
10 0
3 8
8 2
3 1
9 5
9 1
5 4
4 6
10 7
2 0
10 9
9 0
9 9
6 2
3 9
10 8
7 0
7 3
6 0
5 2
6 5
4 7
1 3
9 7
1 5
4 1
7 10
0 2
0 8
9 10
0 5
4 10
7 4
1 8
2 7
10 3
9 3
10 5
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;
int get() {
  int f = 0, v = 0;
  char ch;
  while (!isdigit(ch = getchar()))
    if (ch == '-') break;
  if (ch == '-')
    f = 1;
  else
    v = ch - '0';
  while (isdigit(ch = getchar())) v = v * 10 + ch - '0';
  if (f)
    return -v;
  else
    return v;
}
const int maxn = 100033;
int n, x[maxn], y[maxn], ans = 0;
vector<int> a[maxn], b[maxn];
int main() {
  n = get();
  for (int i = 1; i <= n; i++) {
    x[i] = get(), y[i] = get();
    a[x[i]].push_back(y[i]), b[y[i]].push_back(x[i]);
  }
  for (int i = 0; i <= 100000; i++)
    sort(a[i].begin(), a[i].end()), sort(b[i].begin(), b[i].end());
  for (int i = 1; i <= n; i++) {
    int j = upper_bound(a[x[i]].begin(), a[x[i]].end(), y[i]) - a[x[i]].begin(),
        rj = a[x[i]].size();
    int k = upper_bound(b[y[i]].begin(), b[y[i]].end(), x[i]) - b[y[i]].begin(),
        rk = b[y[i]].size();
    while (j < rj && k < rk) {
      int tp = a[x[i]][j] - y[i] - (b[y[i]][k] - x[i]);
      if (!tp) {
        int yy = a[x[i]][j], xx = b[y[i]][k];
        if (*lower_bound(a[xx].begin(), a[xx].end(), yy) == yy) ans++;
        j++, k++;
      } else
        tp > 0 ? k++ : j++;
    }
  }
  printf("%d\n", ans);
  return 0;
}
