#include <iostream>
using namespace std;
int main()
{
int n,i,j,a[25][25],ct=1;
cin>>n;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++,ct++)
if(i%2==1)
a[i][j]=ct;
else
a[i][n-j+1]=ct;
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
cout<<a[i][j]<<" ";
cout<<endl;
}
return 0;
}