def main():
    N = int(input())
    from collections import deque
    ans = []
    for i in range(1, N//2 + 1):
        ans.append(i)
        ans.append(0--N//2 + i)
    ans.append(0--N//2)
    ans = deque(ans)
    for i in range(N):
        print(*ans)
        ans.rotate(-1)


if __name__ == '__main__':
    main()