codeforces 334A

#include <cstdio>
#include <algorithm>
using namespace std;
int N, n;
int main()
{
    while(~scanf ("%d", &N))
    {
        n = N*N;
        for (int i = 0; i < N; i++)
        {
            for (int p = 1; p <= N/2; p++)
            {
                printf ("%d %d ", i*(N/2)+p, n-(i*(N/2)+p)+1);
            }
            printf ("\n");
        }
    }
    return 0;
}