81
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85
 0
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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/priority_queue.hpp>
//#pragma GCC optimize("O3")
//#pragma GCC target("sse4")
//#pragma GCC target("avx2")

#define exist(x, y) (x).find(y) != (x).end()
#define deb(x) cout << #x << " = " << x << "\n"
#define all(x) (x).begin(), (x).end()
#define len(x) (int) x.size()
#define lsb(x) (x) & -(x)
#define l(x) (x << 1) + 1
#define r(x) (x << 1) + 2

#define xx first
#define yy second
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound

using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;
typedef pair <ld, ld> pld;
typedef pair <ll, ll> pll;

template <class T1, class T2, class T3 = less <T1>> using pb_map = tree <T1, T2, T3, rb_tree_tag, tree_order_statistics_node_update>;
//template <class T1, class T2 = less <T1>> using pb_heap = __gnu_pbds::priority_queue <T1, T2, binary_heap_tag>;
template <class T1, class T2 = null_type, class T3 = hash <T1>> using pb_umap = gp_hash_table <T1, T2, T3>;
template <class T1, class T2, class T3 = hash <T1>> using umap = unordered_map <T1, T2, T3>;
template <class T> using uset = unordered_set <T>;
template <class T> using vec = vector <T>;

const ll infll = numeric_limits <ll>::max() >> 1;
const int inf = numeric_limits <int>::max() >> 1;
const int N = 1e5 + 1;
const int B = 320;
bool vis_x[N];
bool vis_y[N];
int ans;
int n;

pb_umap <int> x[N];
pb_umap <int> y[N];

void input() {
    cin >> n;
    for(int i = 1; i <= n; ++i) {
        int a; cin >> a;
        int b; cin >> b;
        x[a].insert(b);
        y[b].insert(a);
    }
}

void process(pb_umap <int> x[N], int i, queue <int> &qy, bool vis_y[]) {
    for(auto it1 = x[i].begin(); it1 != x[i].end(); ++it1) {
        for(auto it2 = x[i].begin(); it2 != it1; ++it2) {
            int j1 = *it1;
            int j2 = *it2;
            if(j1 > j2) {
                swap(j1, j2);
            }
            if(i + j2 - j1 < N && exist(x[i + j2 - j1], j1) && exist(x[i + j2 - j1], j2)) {
                ans++;
            }
            if(i - j2 + j1 >= 0 && exist(x[i - j2 + j1], j1) && exist(x[i - j2 + j1], j2)) {
                ans++;
            }
        }
        if(exist(y[*it1], i)) {
            y[*it1].erase(i);
        }
        if(len(y[*it1]) < B && !vis_y[*it1]) {
            vis_y[*it1] = 1;
            qy.push(*it1);
        }
    }
    x[i].clear();
}

void solve() {
    queue <int> qx;
    queue <int> qy;
    for(int i = 0; i < N; ++i) {
        if(len(x[i]) < B) {
            vis_x[i] = 1;
            qx.push(i);
        }
    }
    for(int i = 0; i < N; ++i) {
        if(len(y[i]) < B) {
            vis_y[i] = 1;
            qy.push(i);
        }
    }
    while(!qx.empty() || !qy.empty()) {
        if(!qx.empty()) {
            process(x, qx.front(), qy, vis_y);
            qx.pop();
        }
        else {
            process(y, qy.front(), qx, vis_x);
            qy.pop();
        }
    }
    cout << ans << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    input();
    solve();
}
