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 (s:int64) (t:int64) :int64 =
    match s with
    | 0L -> t
    | _ -> gcd (t%s) s

let lcm (s:int64) (t:int64) :int64 = s * t / (gcd s t)

type Sol() =
    member this.Solve() = 
        
        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"
        
let mySol = new Sol()
mySol.Solve()