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85
 0
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 40
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 101

#include <bits/stdc++.h>
using namespace std;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
clock_t START;
inline long double TIME() {
  return (long double)(clock() - START) / CLOCKS_PER_SEC;
}
void SHOW() {
  cout << fixed << setprecision(10);
  cout << TIME() << " SECONDS FROM START\n";
}
long double TL = 2.0;
int calls = 0;
inline bool IS() {
  if (TL - TIME() < 0.1) return true;
  return false;
}
template <typename T1, typename T2>
inline bool amin(T1 &a, T2 b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <typename T1, typename T2>
inline bool amax(T1 &a, T2 b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> &p) {
  os << p.first << ' ' << p.second;
  return os;
}
template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
  is >> p.first >> p.second;
  return is;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v) {
  for (auto &u : v) is >> u;
  return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &v) {
  for (auto &u : v) os << u << ' ';
  return os;
}
int hash_mod[4] = {1000000007, 998244353, 1000000009, 999999937},
    mod = hash_mod[rnd() % 4];
int hash_pows[4] = {179, 239, 1007, 2003}, P = hash_pows[rnd() % 4];
int binpow(int first, int p) {
  int res = 1;
  while (p) {
    if (p % 2) res = (res * first) % mod;
    first = (first * first) % mod;
    p /= 2;
  }
  return res;
}
const int N = 1e6 + 7, M = 2e3 + 7, lg = 20, sq = 550, inf = 2e9 + 7;
const long double eps = 1e-9, pi = 3.14159265359;
vector<int> vx[N], vy[N];
int first[N], second[N];
void solve() {
  int n, ans = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> first[i] >> second[i];
    vy[first[i]].push_back(second[i]);
    vx[second[i]].push_back(first[i]);
  }
  for (int i = 0; i < N; i++) {
    sort((vx[i]).begin(), (vx[i]).end());
    sort((vy[i]).begin(), (vy[i]).end());
  }
  for (int i = 0; i < n; i++) {
    if (vx[second[i]].size() < vy[first[i]].size()) {
      int it = 0;
      for (auto u : vx[second[i]]) {
        if (u >= first[i]) break;
        int need = second[i] - (first[i] - u);
        while (it < vy[first[i]].size() && vy[first[i]][it] < need) it++;
        if (it == vy[first[i]].size()) break;
        if (vy[first[i]][it] == need) {
          if (first[i] - u != second[i] - vy[first[i]][it]) assert(0);
          ans++;
        }
      }
    } else {
      int it = 0;
      for (auto u : vy[first[i]]) {
        if (u >= second[i]) break;
        int need = first[i] - (second[i] - u);
        while (it < vx[second[i]].size() && vx[second[i]][it] < need) it++;
        if (it == vx[second[i]].size()) break;
        if (vx[second[i]][it] == need) {
          if (second[i] - u != first[i] - vx[second[i]][it]) assert(0);
          ans++;
        }
      }
    }
  }
  cout << ans;
}
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  solve();
}
