package main

import (
	"bufio"
	"fmt"
	"math/big"
	"os"
	"sort"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)
var wr = bufio.NewWriter(os.Stdout)

func out(x ...interface{}) {
	fmt.Fprintln(wr, x...)
}

func getI() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func getF() float64 {
	sc.Scan()
	i, e := strconv.ParseFloat(sc.Text(), 64)
	if e != nil {
		panic(e)
	}
	return i
}

func getInts(N int) []int {
	ret := make([]int, N)
	for i := 0; i < N; i++ {
		ret[i] = getI()
	}
	return ret
}

func getS() string {
	sc.Scan()
	return sc.Text()
}

// min, max, asub, absなど基本関数
func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func asub(a, b int) int {
	if a > b {
		return a - b
	}
	return b - a
}

func abs(a int) int {
	if a >= 0 {
		return a
	}
	return -a
}

func lowerBound(a []int, x int) int {
	idx := sort.Search(len(a), func(i int) bool {
		return a[i] >= x
	})
	return idx
}

func upperBound(a []int, x int) int {
	idx := sort.Search(len(a), func(i int) bool {
		return a[i] > x
	})
	return idx
}

func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gcd(b, a%b)
}

func f(T, A, B int) int {
	G := gcd(A, B)
	a := big.NewInt(int64(A))
	b := big.NewInt(int64(B))
	g := big.NewInt(int64(G))
	l := big.NewInt(int64(A))
	l = l.Div(l, g)
	l = l.Mul(l, b)

	t0 := big.NewInt(int64(T - 1))
	t1 := big.NewInt(int64(T - 1))
	t2 := big.NewInt(int64(T - 1))

	t0 = t0.Div(t0, a)
	t0 = t0.Add(t0, t1.Div(t1, b))
	t0 = t0.Sub(t0, t2.Div(t2, l))

	N := t0.Int64() + 1
	return int(N)
}
func main() {
	defer wr.Flush()
	sc.Split(bufio.ScanWords)
	sc.Buffer([]byte{}, 1000000)
	// this template is new version.
	// use getI(), getS(), getInts(), getF()
	T, A, B := getI(), getI(), getI()
	out(f(T, A, B))
}