#include <fstream>

using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int a,n,cn,x0,x1,r,c,x;
int main()
{
    in>>a>>n;
    cn=n;
    x0=1;
    x1=0;
    while(n!=0)
    {
        r=a%n;
        c=a/n;
        a=n;
        n=r;
        x=x0-c*x1;
        x0=x1;
        x1=x;
    }
    if(x0<0)
    x0+=cn;
    out<<x0<<'\n';
    return 0;
}