#include<bits/stdc++.h>
using namespace std;
int a[105][105],t,n;
int main()
{
cin>>n;
for(int k=1;k<=n;k++)
{
if(k%2==0)
for(int i=1;i<=k;i++)
{
int j=k+1-i;
a[i][n+1-j]=++t;
a[n+1-i][j]=n*n+1-t;
}
else
for(int j=1;j<=k;j++)
{
int i=k+1-j;
a[i][n+1-j]=++t;
a[n+1-i][j]=n*n+1-t;
}
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
cout<<setw(5)<<a[i][j];
cout<<endl;
}

return 0;
}