import java.util.*;

public class Main {

	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[][] field = new int[n + 2][n + 2];
		for (int i = 0; i < n + 2; i++) {
		    Arrays.fill(field[i], Integer.MAX_VALUE);
		    if (i == 0 || i == n + 1) {
		        continue;
		    }
		    for (int j = 1; j <= n; j++) {
		        field[i][j] = 0;
		    }
		}
		boolean isVertical = false;
		boolean isUp = true;
		int idx = 1;
		int h = 1;
		int w = 1;
		while (idx <= n * n) {
		    field[h][w] = idx;
		    idx++;
		    int nextH;
		    int nextW;
		    if (isVertical) {
		        if (isUp) {
		            nextH = h + 1;
		        } else {
		            nextH = h - 1;
		        }
		        nextW = w;
		    } else {
		        if (isUp) {
		            nextW = w + 1;
		        } else {
		            nextW = w - 1;
		        }
		        nextH = h;
		    }
		    if (field[nextH][nextW] == 0) {
		        h = nextH;
		        w = nextW;
		        continue;
		    }
		    if (isVertical) {
		        isVertical = false;
		        isUp = !isUp;
		    } else {
		        isVertical = true;
		    }
		    if (isVertical) {
		        if (isUp) {
		            h = h + 1;
		        } else {
		            h = h - 1;
		        }
		    } else {
		        if (isUp) {
		            w = w + 1;
		        } else {
		            w = w - 1;
		        }
		    }
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 1; i <= n; i++) {
		    for (int j = 1; j <= n; j++) {
		        if (j != 1) {
		            sb.append(" ");
		        }
		        sb.append(String.format("%03d", field[i][j]));
		    }
		    sb.append("\n");
		}
		System.out.print(sb);
	}
}