#include <stdio.h>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <vector>
using namespace std;
#define Max 100001

int a,n;

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

int main()
{
	int d,x,y;
	freopen("test.in","r",stdin);
	freopen("test.out","w",stdout);
		scanf("%d %d",&a,&n);
		Euclid(a,n,d,x,y);
		if(x<0)x=x+(x/n+1)*n;
		printf("%d\n",x);
		

	return 0;
}