Naive C# Pipe implementation

Pipe.cs

using System;
using System.Collections.Generic;
using System.Linq;

public static class Test
{
    static Test()
    {
        1d.Pipe(TimeSpan.FromDays, AddHours(3), ToString, ToLower);

        Enumerable.Range(0, 100).Pipe(
            Select(n => n * 2),
            Where(n => n % 2 > 0),
            Enumerable.Sum,
            Convert.ToString
        );
    }

    public static Func<TimeSpan, TimeSpan> AddHours(int hours)
       => (TimeSpan timeSpan) => timeSpan.Add(TimeSpan.FromHours(hours));

    public static string ToString(this TimeSpan timeSpan)
        => timeSpan.ToString();

    public static string ToLower(this string str)
        => str.ToLower();

    public static Func<IEnumerable<int>, IEnumerable<int>> Select(Func<int, int> selector)
        => (IEnumerable<int> list) => list.Select(selector);

    public static Func<IEnumerable<int>, IEnumerable<int>> Where(Func<int, bool> filter)
        => (IEnumerable<int> list) => list.Where(filter);
}

public static class PipeExtensions
{
    public static TResult Pipe<TInput, TResult>
        (this TInput input,
            Func<TInput, TResult> func)
        => func(input);

    public static TResult1 Pipe<TInput, TResult, TResult1>
        (this TInput input,
            Func<TInput, TResult> func,
            Func<TResult, TResult1> func1)
        => func1(func(input));

    public static TResult2 Pipe<TInput, TResult, TResult1, TResult2>
        (this TInput input,
            Func<TInput, TResult> func,
            Func<TResult, TResult1> func1,
            Func<TResult1, TResult2> func2)
        => func2(func1(func(input)));

    public static TResult3 Pipe<TInput, TResult, TResult1, TResult2, TResult3>
        (this TInput input,
            Func<TInput, TResult> func,
            Func<TResult, TResult1> func1,
            Func<TResult1, TResult2> func2,
            Func<TResult2, TResult3> func3)
        => func3(func2(func1(func(input))));

    public static TResult4 Pipe<TInput, TResult, TResult1, TResult2, TResult3, TResult4>
        (this TInput input,
            Func<TInput, TResult> func,
            Func<TResult, TResult1> func1,
            Func<TResult1, TResult2> func2,
            Func<TResult2, TResult3> func3,
            Func<TResult3, TResult4> func4)
        => func4(func3(func2(func1(func(input)))));
}