#include <cstdio>

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

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

    return 0;
}