#include<stdio.h>
int a,n;

void euclid(int a, int b, int &x, int &y, int &d)
{
	if(b==0)
	{
		x=1;
		y=0;
		d=a;
	}
	else
	{
		int x1,y1;
		euclid(b,a%b,x1,y1,d);
		x=y1;
		y=x1-a/b*y1;
	}
}

void read()
{
	freopen("inversmodular.in","r",stdin);
	freopen("inversmodular.out","w",stdout);
	scanf("%d%d",&a,&n);
	int x,y,d;
	euclid(a,n,x,y,d);
	x=1/d*x;
	if(x<0)
		printf("%d\n",(x+n)%n);
	else
		printf("%d\n",x%n);
}

int main()
{
	read();
	return 0;
}