#include <bits/stdc++.h>
#define nmax 1003

using namespace std;

ifstream fin ("trapez.in");
ofstream fout ("trapez.out");

struct p{
    int a,b;
}v[nmax];

struct l{
    int x,y,m;
}vv[nmax*nmax];

int n;



int main()
{
    fin>>n;
    for(int i=1;i<=n;++i)
        fin>>v[i].a>>v[i].b;
    for(int i=1;i<=n;++i)
        for(int j=i+1;j<=n;++j)
            vv[++k]={i,j,d(i,j)};
    return 0;
}