#nullable enable

var n = Int128.Parse(Console.ReadLine()!);
var ans = new List<(Int128, Int128)>();
static Int128 F(Int128 l, Int128 d)
{
    var r = l + d;
    var ru = r * (r + 1);
    var lu = l * (l + 1);
    return ru * ru - lu * lu;
}
var m = n * 4;
var max = 200000;
for (Int128 l = 1; l <= max; l++)
{
    Int128 pass = 0;
    Int128 fail = int.MaxValue;
    while (fail - pass > 1)
    {
        var mid = (pass + fail) >> 1;
        if (F(l, mid) <= m) pass = mid;
        else fail = mid;
    }
    if (F(l, pass) == m) ans.Add((l + 1, l + pass));
}
for (Int128 d = 1; d <= max; d++)
{
    Int128 pass = 0;
    Int128 fail = int.MaxValue;
    while (fail - pass > 1)
    {
        var mid = (pass + fail) >> 1;
        if (F(mid, d) <= m) pass = mid;
        else fail = mid;
    }
    if (F(pass, d) == m) ans.Add((pass + 1, pass + d));
}

ans = ans.Distinct().ToList();
ans.Sort();
Console.WriteLine(ans.Count);
if (ans.Count > 0) Console.WriteLine(string.Join(Environment.NewLine, ans.Select(e => e.Item1 + " " + e.Item2)));