#include <iostream>

using namespace std;

int main()
{
    int n,i,j,a[24][24];
    cin>>n;
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){
            if((i+1)%2==0) a[i][j]=j+1;
            else a[i][j]=i+1;
            cout<<a[i][j]<<" ";
        }
        cout<<endl;
    }
    return 0;
}