#include<cstdio>
using namespace std;
struct trapez
{
    int linie,coloana;
};
trapez v[1001];
bool sortare(trapez a,trapez b)
{
    return a.linie<b.linie;
}
bool sortare2(trapez a,trapez b)
{
    return a.coloana<b.coloana;
}
int main()
{
    freopen("trapez.in","r",stdin);
    freopen("trapez.out","w",stdout);
    int n;
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&v[i].linie,&v[i].coloana);
    }
    sort(v+1,v+n+1,sortare);
    return 0;
}