n = int(input()) a = [[0 for _ in range(n)]for _ in range(n)] f = 1 id = 1 for j in range(n): if f == 1: for i in range(n): a[i][j] = id id += 1 else: for i in range(n - 1, -1, -1): a[i][j] = id id += 1 f = -f for i in range(n): for j in range(n): print("%3d" %a[i][j], end = " ") print()