namespace AtCoder;

#nullable enable

using System.Numerics;

static class Extensions
{
    public static T[] Repeat<T>(this int time, Func<T> F) => Enumerable.Range(0, time).Select(_ => F()).ToArray();
}

class AtCoder
{
    object? Solve()
    {
        var u = 1024;
        var h = 13;
        var n = u + u - 1 + u * h + u * h * (h - 1);
        Out(n);
        var l = new List<(int, int)>();
        for (var i = 1; i < u; i++)
        {
            l.Add((i, i * 2));
            l.Add((i, i * 2 + 1));
        }
        var t1 = u * 2;
        var t2 = u * (h + 2);
        for (var i = 0; i < u; i++)
        {
            var b = u + i;
            for (var j = 0; j < h; j++)
            {
                l.Add((b, t1));
                for (var k = 0; k < h - 1; k++)
                {
                    l.Add((t1, t2));
                    t2++;
                }
                t1++;
            }
        }
        foreach (var (x, y) in l) Out(x + " " + y);
        return null;
    }

    public static void Main() => new AtCoder().Run();
    public void Run()
    {
        var res = Solve();
        if (res != null)
        {
            if (res is bool yes) res = yes ? "Yes" : "No";
            sw.WriteLine(res);
        }
        sw.Flush();
    }

    string[] input = Array.Empty<string>();
    int iter = 0;
    readonly StreamWriter sw = new(Console.OpenStandardOutput()) { AutoFlush = false };

    #pragma warning disable IDE0051
    string String()
    {
        while (iter >= input.Length) (input, iter) = (Console.ReadLine()!.Split(' '), 0);
        return input[iter++];
    }
    T Input<T>() where T : IParsable<T> => T.Parse(String(), null);
    int Int() => Input<int>();
    void Out(object? x, string? separator = null)
    {
        separator ??= Environment.NewLine;
        if (x is System.Collections.IEnumerable obj and not string)
        {
            var firstLine = true;
            foreach (var item in obj)
            {
                if (!firstLine) sw.Write(separator);
                firstLine = false;
                sw.Write(item);
            }
        }
        else sw.Write(x);
        sw.WriteLine();
    }
    #pragma warning restore IDE0051
}