#include<bits/stdc++.h>
using namespace std;
int a,t=1; 
int main(){
    cin>>a;
    for(int i=1;i<=a;i++){
    	for(int j=1;j<=a;j++){
    		cout<<(i%2==1?t:t-(j-1)+(a-j))<<" ";
    		t++;
    	}
    	cout<<"\n";
    }
    return 0;
}