81
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100000 100000
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1 7
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1 1
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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 INF = 1000000404;
const long long MOD = 1000000007ll;
const long double PI = acos(-1.0);
const long double EPS = 1e-9;
template <typename t1, typename t2>
inline void upmax(t1 &a, t2 b) {
  a = max(a, (t1)b);
}
template <typename t1, typename t2>
inline void upmin(t1 &a, t2 b) {
  a = min(a, (t1)b);
}
template <typename T>
inline T gcd(T a, T b) {
  return b ? gcd(b, a % b) : a;
}
template <typename T>
inline T lcm(T a, T b) {
  return a * (b / gcd(a, b));
}
template <typename T>
inline T sqr(T a) {
  return a * a;
}
template <typename T>
inline bool pal(T &x) {
  int n = (int((x.size())));
  for (int i = 0; i < n / 2; i++) {
    if (x[i] != x[n - i - 1]) return 0;
  }
  return 1;
}
template <typename T>
inline void rev(T &x) {
  int n = (int((x.size())));
  for (int i = 0; i < n / 2; i++) swap(x[i], x[n - i - 1]);
}
int month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int dx[] = {1, 0, -1, 0, 1, 1, -1, -1};
int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
inline long long mp(long long a, long long b) { return (a << 31) + b; }
class compare {
 public:
  bool operator()(const int a, const int b) const { return 1; }
};
int SQ = 400;
vector<int> x[111111];
vector<int> y[111111];
void solve() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int a, b;
    cin >> a >> b;
    x[a].push_back(b);
  }
  for (int i = 0; i < 111111; i++) sort((x[i]).begin(), (x[i]).end());
  SQ = (int)sqrt(n) + 1;
  int ans = 0;
  for (int i = 0; i < 111111; i++) {
    if ((int((x[i].size()))) <= SQ) {
      for (auto &a : x[i]) {
        for (auto &b : x[i]) {
          if (a >= b) continue;
          int d = abs(a - b);
          if (i + d < 111111 &&
              binary_search((x[i + d]).begin(), (x[i + d]).end(), a) &&
              binary_search((x[i + d]).begin(), (x[i + d]).end(), b))
            ans++;
        }
      }
    } else {
      for (auto &a : x[i]) y[a].push_back(i);
    }
  }
  for (int i = 0; i < 111111; i++) sort((y[i]).begin(), (y[i]).end());
  for (int i = 0; i < 111111; i++) {
    for (auto &a : y[i]) {
      for (auto &b : y[i]) {
        if (a >= b) continue;
        int d = abs(a - b);
        if (i + d < 111111 &&
            binary_search((y[i + d]).begin(), (y[i + d]).end(), a) &&
            binary_search((y[i + d]).begin(), (y[i + d]).end(), b))
          ans++;
      }
    }
  }
  cout << ans;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
  while (t--) {
    solve();
  };
  getchar();
  getchar();
  return 0;
}
