import java.util.Scanner;

public class Problem1 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int rowsAndcols = Integer.parseInt(input.nextLine());

int[][] size = new int[rowsAndcols][rowsAndcols];

int currentNum = 1;

for (int col = 0; col < rowsAndcols; col++) {

if(col%2 == 0){

for (int row = 0; row < rowsAndcols; row++) {

size[col][row] = currentNum;

currentNum++;

}

}

else{

for (int row = rowsAndcols-1; row >= 0; row--) {

size[col][row] = currentNum;

currentNum++;

}

}

}

for (int row = 0; row < rowsAndcols; row++) {

for (int col = 0; col < rowsAndcols; col++) {

System.out.print(size[col][row] + " ");

}

System.out.println();

}

}

}