#include<fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
inline void euclid(int&x,int&y,int a,int b)
{
	if(!b)
	{
		x=1;
		y=0;
		return;
	}
	int x0,y0;
	euclid(x0,y0,b,a%b);
	x=y0;
	y=x0-(a/b)*y0;
}
int main()
{
	int a,b,x,y;
	f>>a>>b;
	euclid(x,y,a,b);
	if(x<=0)
		x=x%b+b;
	g<<x<<'\n';
	f.close();
	g.close();
	return 0;
}