package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	sc.Split(bufio.ScanWords)
	t1, t2, t3 := nextInt64(), nextInt64(), nextInt64()

	m := lcm(lcm(t1*t2, t1*t3), lcm(t2-t1, t3-t1))
	r := big.NewRat(t1*t2*m, m*(t2-t1))
	fmt.Println(r)
}

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

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextInt64() int64 {
	i, _ := strconv.ParseInt(nextLine(), 10, 64)
	return i
}

func nextUint64() uint64 {
	i, _ := strconv.ParseUint(nextLine(), 10, 64)
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}

func gcd(a, b int64) int64 {
	for ; b != 0; b, a = a%b, b {
	}
	return a
}

func lcm(a, b int64) int64 {
	return (a * b) / gcd(a, b)
}