#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef double ld;

typedef pair<ll, ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;

#define PB push_back
#define ff first
#define ss second
#define MP make_pair

#define FOR(prom, a, b) for ( ll prom = (a); prom < (ll)b; ++prom)
#define F(a) FOR(i,0,a)
#define FF(a) FOR(j, 0, a)

#define EPS (1e-10)
#define EQ(a, b) (fabs(a-b) <= fabs(a+b)*EPS)
#define LINF (1<<62LL)
#define DEB(x) cerr << ">>> " << #x << " ; " << x << "\n"

ld pyt(ld a,ld b)
{
    return sqrt(a*a + b*b);
}

int main()
{
    int n, hvezdy[1008][2];
    ll pocet,pocetnovy,uzmame;
    ld uhlystare[1008],uhlynove[1008],vzdalenostistare[1008],vzdalenostinove[1008];
    ld s1,s2,uhel,vzdalenost;
    
    
    cin >> n;
    F(n) cin >> hvezdy[i][0] >> hvezdy[i][1];
    
    pocet = n-1;
    
    FOR(i,1,n)
    {
        s1=hvezdy[0][0] - hvezdy[i][0];
        s2=hvezdy[0][1] - hvezdy[i][1];
        uhlystare[i-1] = s1?tan(s2/s1):999999;
        vzdalenostistare[i-1] = pyt(s1,s2);
    }
    
    FOR(i,1,n) 
    {
        pocetnovy=0;
        FOR(j,0,n) if(i!=j)
        {
            //cerr << "porovnavame hvezdy " << i << " - " << j << "\n";
            //cerr << "uhly stare: \n";
            //FOR(u,0,pocet) cerr << uhlystare[u] << " - " << vzdalenostistare[u] << "\n";
            //cerr << "-------\n";
            
            s1=hvezdy[j][0] - hvezdy[i][0];
            s2=hvezdy[j][1] - hvezdy[i][1];
            uhel = s1?tan(s2/s1):999999;
            vzdalenost = pyt(s1,s2);
            
            uzmame = 0;
            FOR(k,0,pocetnovy) if(EQ(uhel,uhlynove[k]) && EQ(vzdalenost,vzdalenostinove[k])) uzmame=1;
            if(!uzmame) FOR(k,0,pocet) if(EQ(uhel,uhlystare[k]) && EQ(vzdalenost,vzdalenostistare[k]))
            {
                //DEB(vzdalenost);
                //DEB(uhel);
                //DEB(pocetnovy);
                uhlynove[pocetnovy] = uhel;
                vzdalenostinove[pocetnovy] = vzdalenost;
                pocetnovy++;
                break;
            }
        }
        FF(pocetnovy)
        {
            uhlystare[j]=uhlynove[j];
            vzdalenostistare[j]=vzdalenostinove[j];
        }
        pocet = pocetnovy;
    }
    
    cout << pocet * 2 << "\n";


return 0;
}