#include<stdio.h>



void euclid (int a,int b,int &x,int &y)
{
	if (b==0)
	{
		x=1;
		y=0;
		return;
	}
	int xx,yy;
	euclid(b,a%b,xx,yy);
	x=yy;
	y=xx-yy*(a/b);
}


int main()
{
	int a,n,x,y;
	freopen("inversmodular.in","r",stdin);
	freopen("inversmodular.out","w",stdout);
	scanf("%d%d",&a,&n);
	euclid(a,n,x,y);
	if (x>0)
		printf("%d",x%n);
	else
		printf("%d",n+x%n);
}