#include<iostream>
using namespace std;
long gcd(long a,long b){return b?gcd(b,a%b):a;}
long P,Q;
int main()
{
	cin>>P>>Q;
	long Lp=0,Lq=1,Rp=1,Rq=0;
	for(int a=1;a<P;a++)
	{
		{
			long b=P*a/Q+1;
			while(gcd(a,b)>1)b++;
			if(Lp*b<a*Lq)Lp=a,Lq=b;
		}
		{
			long b=(P*a+Q-1)/Q-1;
			while(gcd(a,b)>1)b--;
			if(Rp*b>a*Rq)Rp=a,Rq=b;
		}
	}
	cout<<Lp+Lq+Rp+Rq<<endl;
}