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

type Sol() =
    member this.Solve() = 
        
        let rec gcd s t = if s = 0L then t else gcd (t%s) s
        let lcm s t = s * t / (gcd s t)
        
        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()