#include <fstream>
using namespace std;
int gcd(int a,int b,int &x,int &y)
{
	if(!b)
	{
		x=1;
		y=0;
		return a;
	}
	int x0,y0,d;
	d=gcd(b,a%b,x0,y0);
	x=y0;
	y=x0-(a/b)*y0;
	return d;
}
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int main()
{
	int a,b,x,y;
	fin>>a>>b;
	gcd(a,b,x,y);
	fout<<x<<"\n";
	return 0;
}