#include<iostream.h>
int a[21][21],n;
void main()
{ cin>>n;
  int par=2;
  int imp=1;
  int i,j;
  for(i=1;i<=2*n;i++)
  if(i%2==1)
    for(j=1;j<=2*n;j++) {a[i][j]=imp; imp+=2;}
  else
    for(j=2*n;j>=1;j--) {a[i][j]=par; par+=2;}
  for(i=1;i<=2*n;i++)
   { cout<<endl;
     for(j=1;j<=2*n;j++)
       cout<<a[i][j]<<" ";
   }
}