#include <iostream>
using namespace std;

template <typename T>
T gcd(T a, T b){
	while(b){
		T tmp = b;
		b = a % b;
		a = tmp;
	}
	return a;
}

int main(){
	int m, n;
	cin >> m >> n;
	int g = gcd(m, n);
	m /= g;
	n /= g;
	int ans = 0;
	while(n != m){
		if(n <= m) m -= n;
		else swap(m, n);
		ans++;
	}
	cout << (m == 0 || n == 0 ? -1 : ans) << endl;
}