#include<bits/stdc++.h>

using namespace std;
using ll=int64_t;

int main(){
	ll P,Q;
	cin >> P >> Q;
	
	ll La=0,Lb=1;

	for (int b=1; b<=Q; b++){
		int a=(b*P-1)/Q;
		if (b*La<a*Lb){La=a; Lb=b;}
	}
	
	ll Rc=1, Rd=0;
	for (int d=1; d<=Q; d++){
		int c=(d*Q+1)/Q;
		if (c*Rd<d*Rc){Rc=c; Rd=d;}
	}
	
	cout << La+Lb+Rc+Rd << endl;
}