package main

import (
	"fmt"
)

func gcd(x, y int) int {
	if x < y {
		gcd(y, x)
	}
	if y == 0 {
		return x
	}
	return gcd(y, x%y)
}

func main() {
	var m, n int
	fmt.Scan(&m, &n)
	g := gcd(m, n)
	m /= g
	n /= g
	z := 0
	for m*n > 1 {
		if z > 100000000 {
			z = -1
			break
		}
		if n == 1 {
			z += m - 1
			break
		}
		if m < n {
			m, n = n, m
			z++
		} else {
			m -= n
			z++
		}
	}
	fmt.Println(z)
}