open System

let ri () = stdin.ReadLine() |> int
let ria () = stdin.ReadLine().Split() |> Array.map int
let rl () = stdin.ReadLine() |> int64
let rla () = stdin.ReadLine().Split() |> Array.map int64


let rec gcd (a:int64) (b:int64) :int64 = if a = 0L then b else gcd (b%a) a
let lcm (a:int64) (b:int64) :int64 = a * b / (gcd a b)

let N = rl () 
let [|a; b; c|] = rla ()

let mutable sum = N
sum <- [a;b;c] |> Seq.sumBy (fun x -> N/x ) 
sum <- sum - ([(a,b);(b,c);(c,a)] |> Seq.sumBy (fun (x,y) -> N / (lcm x y) ) )
sum <- sum + (N / (Seq.reduce lcm [a;b;c])) 

sum |> printfn "%d"