#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;

long long gcd(long long a, long long b){
	if(b==0) return a;
	return gcd(b, a%b);
}

// a/b
long long func(int a, int b){
	int ret = 0;
	if(a==0) return -1;

	if(b==1){
		ret += a-1;
		return ret;
	}

	if(a>b){
		ret += a/b;
		a %= b;
	}else if(a==b){
		return -1;
	}else{
		swap(a,b);
		ret += 1;
	}

	ret += func(a,b);
	return ret;

}

int main(){
	long long n,m;
	cin >> m >> n;
	int g = gcd(n,m);
	n/=g;
	m/=g;

	long long ans = func(m,n);
	cout << ans << endl;
	return 0;
}