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
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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
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5 10
6 9
5 4
6 6
8 5
0 7
5 8
1 2
2 2
9 4
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0 10
5 9
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7 9
9 9
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4 10
8 9
7 7
5 2
6 5
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10 6
6 3
9 6
0 9
7 3
7 5
8 4
1 3
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2 10
 49
2 9
7 0
8 0
10 3
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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
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0 8
4 4
5 7
0 0
9 1
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6 4
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8 4
0 9
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7 7
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 72
8 2
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7 6
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0 0
3 3
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7 10
8 8
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6 0
3 6
9 3
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0 7
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2 6
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0 6
5 6
6 6
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9 9
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8 7
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3 8
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7 4
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 71
5 3
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9 5
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6 3
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3 7
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9 10
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6 5
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9 6
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1 3
9 3
7 6
6 7
4 4
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2 9
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4 3
 1
100000 100000
 87
5 10
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4 4
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1 0
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5 3
1 6
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5 6
5 9
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2 6
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8 9
8 8
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6 1
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10 1
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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

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#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
// #define int long long int
// #define ll long long int
#define ld long double
#define ff first
#define ss second
#define mp make_pair
#define IOS std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define eb emplace_back
#define pii pair<int, int>
#define endl '\n'
#define all(x) x.begin(),x.end()
#define f(i,j,l) for(i=j;i<l;i++)
#define smax(a,b) a=max(a,b)
// #if !defined(ONLINE_JUDGE)
// #include "debugging.h"
// #endif
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
// find_by_order(k)  returns iterator to kth element starting from 0;
// order_of_key(k) returns count of elements strictly smaller than k;
// erase,insert same as normal set

// int const mod = 7340033;
int const mod = 998244353;
// long long const mod = 1e9+7;
int power(int a,int b,int m){
    int res = 1;
    while(b){
        if(b&1){
            // res = res*a;
            res = (res*a)%m;
        }
        a=(a*a)%m;
        // a%=m;
        b=b/2;
    }
    return res;
}

int inverse(int x , int m){
    return power(x,m-2,m);
}


int const N = 1e5+5;
int const inf = 1e9;   

vector<int> xx[N], yy[N];
unordered_map<int, int> m1[N];
unordered_map<int, int> vis[N];

void solve(){
    int i,j;
    int n; cin>>n;
    for(i=0;i<n;i++){
        int x,y; cin>>x>>y;
        xx[x].pb(y);
        yy[y].pb(x);
        m1[x][y] = 1;
    }
    int sq = sqrt(n) + 10;
    for(int x=0;x<N;x++) sort(all(xx[x]));
    for(int y=0;y<N;y++) sort(all(yy[y]));
    int ans = 0;
    for(int x = 0; x < N; x++){
        if(xx[x].size() < sq){
            for(int i1=0;i1<xx[x].size();i1++){
                for(int j1=i1+1;j1<xx[x].size();j1++){
                    int y1 = xx[x][i1];
                    int y2 = xx[x][j1];

                    int l = y2-y1;
                    int x2 = x+l;

                    if(m1[x2].find(y1) != m1[x2].end() && m1[x2].find(y2) != m1[x2].end()) {
                        ans++; vis[x][l] = 1;
                    }
                }
            }
        }
    }

    for(int y=0;y<N;y++){
        if(yy[y].size() < sq){
            for(int i1=0;i1<yy[y].size();i1++){
                for(int j1=i1+1;j1<yy[y].size();j1++){
                    int x1 = yy[y][i1];
                    int x2 = yy[y][j1];

                    int l = x2-x1;
                    if(vis[x1].find(l) != vis[x1].end()) continue;
                    int y2 = y+l;

                    if(m1[x1].find(y2) != m1[x1].end() && m1[x2].find(y2) != m1[x2].end()){
                        ans++; vis[x1][l] = 1;
                    }
                }
            }
        }
    }

    cout<<ans<<endl;
}


int32_t main(){
    IOS;
    int t;
    t = 1;
    // cin>>t;  
    for(int tt=1;tt<=t;tt++){
        // cout << "Case #"<<tt<<": ";
        solve();
    }
    return 0;
}

/*

*/