#include<stdio.h>

int n,k,x,y;

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


int main()
{
	freopen("inversmodular.in","r",stdin);
	freopen("inversmodular.out","w",stdout);
	
	scanf("%d%d",&n,&k);
	
	euclid(n,k,x,y);
	while (x<0) x+=k;
	printf("%d\n",x);
	
	return 0;
}