let ``No.26 シャッフルゲーム`` () =
    let N = int <| stdin.ReadLine()
    let M = int <| stdin.ReadLine()
    let rec f s bit =
        if s <= 0 then if bit = 4 then 3 else bit
        else
            let arr = Array.map int <| stdin.ReadLine().Split(' ')
            let a,b2 = min arr.[0] arr.[1],max arr.[0] arr.[1]
            let n = b2 - a
            let b = 1 <<< (b2 - 1)
            let c = (((bit&&&b)>>>n)|||((bit&&&a)<<<n))
            let d = if c = 0 then bit else c
            f (s-1) d
    f M (1 <<< N - 1)
    |> printfn "%A"
``No.26 シャッフルゲーム`` ()