using System;

​

public class mat

{

    public int n,m;

    public float[,] a;

    public void citire()

    {

        a=new float[n,m];

        for(int i=0;i<n;i++)

        {

            for(int j=0;j<m;j++)

            {

                a[i,j]=float.Parse(Console.ReadLine());

            }

        }

    }

    public void afisare()

    {

        for(int i=0;i<n;i++)

        {

            for(int j=0;j<m;j++)

            {

                Console.Write(a[i,j] + " ");

            }

            Console.WriteLine();

        }

    }

}

​

class matpat : mat

{

public float d;

public float[,] invers;

    public matpat(int x)

    {

        m=n=x;

    }

    public void det()

    {

        if(n==2)

        {

            d=a[0,0]*a[1,1]-a[0,1]*a[1,0];

        }

        else{

        d=(a[0,0] * a[1,1] * a[2,2]) + (a[1,0] * a[2,1] * a[0,2]) + (a[2,0] * a[0,1] * a[1,2]) 

            - (a[0,2] * a[1,1] * a[2,0]) - (a[1,2] * a[2,1] * a[0,0]) - (a[1,0] * a[0,1] * a[2,2]);

    }

    }

    public void Inv(){

        if(d!=0){

                invers = new float[n,n];

                if(n==2){

                    invers[0,0]= 1/d * a[1,1];

                    invers[0,1]=-(1/d * a[0,1]);

                    invers[1,0]=-(1/d * a[1,0]);

                    invers[1,1]=1/d * a[0,0];

                }else{

                    invers[0,0] = 1/d * (a[1,1]*a[2,2]-a[1,2]*a[2,1]);

                    invers[0,1] = -1/d * (a[0,1]*a[2,2]-a[0,2]*a[2,1]);

                    invers[0,2] = 1/d * (a[0,1]*a[1,2]-a[0,2]*a[1,1]);

                    invers[1,0] = -1/d * (a[1,0]*a[2,2]-a[1,2]*a[2,0]);

                    invers[1,1] = 1/d * (a[0,0]*a[2,2]-a[0,2]*a[2,0]);

                    invers[1,2] = -1/d * (a[0,0]*a[1,2]-a[0,2]*a[1,0]);

                    invers[2,0] = 1/d * (a[1,0]*a[2,1]-a[1,1]*a[2,0]);

                    invers[2,1] = -1/d * (a[0,0]*a[2,1]-a[0,1]*a[2,0]);

                    invers[2,2] = 1/d * (a[0,0]*a[1,1]-a[0,1]*a[1,0]);

                }

        }

    }

    public void afisareinv()

    {

        for(int i=0;i<n;i++)

        {

            for(int j=0;j<m;j++)

            {

                Console.Write(invers[i,j] + " ");

            }

            Console.WriteLine();

        }

    }

​

}

public class sistem

{

    matpat A,B,X;

    public sistem()

    {

        int x=int.Parse(Console.ReadLine());

        A=new matpat(x);

        B=new matpat(x);

        A.citire();

        B.citire();

    }

    public void produs()

    {

        float[,] R;

        R = new float[A.n,B.n];

        for(int i=0;i<A.n;i++)

        {

            for(int j=0;j<A.n;j++)

            {

                R[i,j]=0;

                for(int k=0;k<A.n;k++)

                {

                    R[i,j]+=A.a[i,k]*B.a[k,j];

                }

            }

        }

    }

}

public class Program

{

    public static void Main()

    {

        matpat A;

        int x;

        x=int.Parse(Console.ReadLine());

        A= new matpat(x);

        A.citire();

        A.det();

        A.afisare();

        Console.WriteLine(A.d);

        A.Inv();

        Console.WriteLine();

        A.afisareinv();

    }

}