using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var len = 2 * n - 1;
        var ans = new int[len][];
        for (var i = 0; i < ans.Length; ++i) ans[i] = new int[n];
        for (var i = 0; i < n; ++i)
        {
            if (i + 1 == n)
            {
                for (var j = 0; j < len; ++j) ans[j][i] = len;
            }
            else
            {
                for (var j = 0; j <= i; ++j) ans[(i + j) % len][i] = i + 1;
                for (var j = i + 1; j < len; ++j) ans[(i + j) % len][i] = len - i - 1;
            }
        }
        WriteLine(len);
        WriteLine(string.Join("\n", ans.Select(ai => string.Join(" ", ai))));
    }
}