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100000 100000
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1 1
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7 5
5 5
1 4
6 8
6 3

85
 0
 0
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#include <bits/stdc++.h>
using namespace std;
const double PI = acos(-1);
const double eps = 1e-12;
const int inf = 2000000000;
const long long int infLL = (long long int)1e18;
long long int MOD = 1000000007;
int MOD1 = 1000000007;
int MOD2 = 1000000009;
inline bool checkBit(long long int n, long long int i) {
  return n & (1LL << i);
}
inline long long int setBit(long long int n, long long int i) {
  return n | (1LL << i);
  ;
}
inline long long int resetBit(long long int n, long long int i) {
  return n & (~(1LL << i));
}
int dx[] = {0, 0, +1, -1};
int dy[] = {+1, -1, 0, 0};
inline bool EQ(double a, double b) { return fabs(a - b) < 1e-9; }
inline bool isLeapYear(long long int year) {
  return (year % 400 == 0) || (year % 4 == 0 && year % 100 != 0);
}
inline void normal(long long int &a) {
  a %= MOD;
  (a < 0) && (a += MOD);
}
inline long long int modMul(long long int a, long long int b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a * b) % MOD;
}
inline long long int modAdd(long long int a, long long int b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a + b) % MOD;
}
inline long long int modSub(long long int a, long long int b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  a -= b;
  normal(a);
  return a;
}
inline long long int modPow(long long int b, long long int p) {
  long long int r = 1LL;
  while (p) {
    if (p & 1) r = modMul(r, b);
    b = modMul(b, b);
    p >>= 1LL;
  }
  return r;
}
inline long long int modDiv(long long int a, long long int b) {
  return modMul(a, modPow(b, MOD - 2));
}
bool comp(const pair<long long int, pair<long long int, long long int> > &p1,
          const pair<long long int, pair<long long int, long long int> > &p2) {
  return p1.first > p2.first;
}
bool comp1(const pair<long long int, long long int> &p1,
           const pair<long long int, long long int> &p2) {
  if (p1.first == p2.first) {
    return p1.second > p2.second;
  }
  return p1.first < p2.first;
}
long long int converter(string a) {
  long long int i, mul = 1, r, t, ans = 0LL;
  if (a.length() == 0) return 0;
  for (i = a.length() - 1; i >= 0; i--) {
    t = a[i] - '0';
    r = t % 10;
    ans += (mul * r);
    mul = mul * 10;
  }
  return ans;
}
int msb(unsigned x) {
  union {
    double a;
    int b[2];
  };
  a = x;
  return (b[1] >> 20) - 1023;
}
const int MAX = (int)1e5 + 5;
vector<long long int> x[MAX];
vector<long long int> y[MAX];
pair<long long int, long long int> p[MAX];
unordered_map<long long int, int> mp[MAX];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long int n, i, j, a, b, ans = 0LL;
  cin >> n;
  for (i = 1; i <= n; ++i) {
    cin >> a >> b;
    p[i] = make_pair(a, b);
    mp[a][b]++;
    x[a].push_back(b);
    y[b].push_back(a);
  }
  for (i = 0; i < MAX; ++i) {
    sort((x[i]).begin(), (x[i]).end());
    sort((y[i]).begin(), (y[i]).end());
  }
  for (i = 1; i <= n; ++i) {
    a = p[i].first;
    b = p[i].second;
    if (x[a].size() <= y[b].size()) {
      for (j = 0; j < x[a].size(); ++j) {
        long long int cury = x[a][j];
        if (cury >= b) break;
        long long int dif = b - cury;
        if (a - dif < 0) continue;
        if (mp[a - dif][b] == 1 && mp[a - dif][cury] == 1) ++ans;
      }
    } else {
      for (j = 0; j < y[b].size(); ++j) {
        long long int curx = y[b][j];
        if (curx >= a) break;
        long long int dif = a - curx;
        if (b - dif < 0) continue;
        if (mp[a][b - dif] == 1 && mp[curx][b - dif] == 1) ++ans;
      }
    }
  }
  cout << ans << '\n';
  return 0;
}
