#include<stdio.h>
int a,n,x,y;
void euclid(int a, int b, int &x, int &y)
{
    int q,t;
    if(b==0)
    {
        x=1;
        y=0;
        return;
    }
    euclid(b,a%b,q,t);
    x=t;
    y=q-t*(a/b);
}
int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&n);
    euclid(a,n,x,y);
    x%=n;
    if(x<=0)x+=n;
    printf("%d",x);
    return 0;
}