#include<fstream>
using namespace std;
int A,N;

int ModN(int x)
{
	int a=x%N;
	if(a<0)
		return (a+N);
	return a;
}

void Euclid_extins(int a,int b,int &x,int &y)
{
	if(b==0)
	{
		x=1;
		y=0;
		return;
	}
	else
	{
		Euclid_extins(b,a%b,x,y);
		int aux,q=a/b;
		aux=x;
		x=y;
		y=aux-y*q;
	}
}

int main()
{
	int inv=0,aux=0;
	ifstream fin("inversmodular.in");
	fin>>A>>N;
	fin.close();
	
	Euclid_extins(A,N,inv,aux);
	
	ofstream fout("inversmodular.out");
	fout<<ModN(inv)<<"\n";
	fout.close();
	return 0;
}