5

#include <iostream>

using namespace std;

int main()
{
   int a[50][50],n,x;
   cout<<"n= ";
   cin>>n;
   x=0;
   for (int i=0;i<n;i++)
   {
      for (int j=0;j<n;j++)
      {
          a[i][j]=x;
          x=x+2;
      }
   }

 for (int i=0;i<n;i++)
   {
      for (int j=0;j<n;j++)
      {
          cout<<a[i][j]<<" ";
      }
      cout<<endl;
   }



    return 0;
}