#include <iostream>
#include <vector>
using namespace std;

int N;
vector<vector<int>> A(310,vector<int>(310,0));
int main(){
    cin >> N;
    for(int j=1;j<=N;j++){
        for(int i=1;i<=N;i++){
            if(j%2==1) A[i][j] = N*(i-1)+j;
            else{
                if(i<=N/2) A[i+N/2][j] = j+N*(i-1);
                else A[i-N/2][j] = j+N*(i-1);
            }
        }
    }
    for(int i=1;i<=N;i++){
        for(int j=1;j<=N;j++) cout << A[i][j] << " ";
        cout << endl;
    }
}