#include<fstream>
using namespace std;

int a,n;
long long x,y;
void euler(int a,int b,long long &x,long long &y)
{
	if(b==0)
	{
		x=1;
		y=0;
	}
	else
	{
	long long aux;
	euler(b,a%b,x,y);
	aux=x;
	x=y;
	y=aux-(a/b)*y;
	}
}
int main()
{
	FILE *f=fopen("inversmodular.in","r");
	FILE *g=fopen("inversmodular.out","w");
	fscanf(f,"%d%d",&a,&n);
	euler(a,n,x,y);
	while(x<0)
		x=n+x%n;
	fprintf(g,"%lld",x);
	return 0;
}