let n = stdin.ReadLine() |> float

let mutable x = 1.
let mutable y = n
let mutable cnt = 0
while x <= y do
    let m = sqrt (x ** 2. + y ** 2.)
    if m = n then
        if x <> y then
            cnt <- cnt + 2
        else
            cnt <- cnt + 1
    if m < n then
        x <- x + 1.
    else
        y <- y - 1.

cnt
|> printfn "%d"