#include <cstdio>

using namespace std;

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

}

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