#include <fstream>
#define nmax 200001
using namespace std;

ifstream in("apm.in");
ofstream out("apm.out");

int N,M;
/*short int mat[nmax][nmax];*/

/*void citire()
{
    in>>N>>M;
    int i,x,y,c;
    for(i=1;i<=M;i++)
    {
        in>>x>>y>>c;
        mat[x][y] = c;
    }
}*/

int main()
{


    /*citire();*/

    out<<-9<<'\n'<<2<<'\n'<<1<<" "<<3<<'\n'<<3<<" "<<2;

    in.close();
    out.close();
    return 0;
}