#include <fstream>

using namespace std;

inline void euclid(int a, int b, long long &x, long long &y)
{
	if (b == 0)
	{
		x = 1;
		y = 0;
	}
	else
	{
		long long x0, y0;
		euclid (b, a%b, x0, y0);
		x = y0;
		y = x0 - (a/b)*y0;
	}
}

int main()
{
	int a, n;
	long long x, y;
	ifstream f("inversmodular.in");
	f>>a>>n;
	f.close();
	
	euclid(a, n, x, y);
	
	if (x<=0)
		x += n;
	
	ofstream g("inversmodular.out");
	g<<x<<"\n";
	g.close();	
	
	return 0;
}