#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int n,a,x,y,cmmdc(int,int,int&,int&);
int main()
{
    f>>a>>n;
    cmmdc(a,n,x,y);
    x=x%n;
    g<<x;
    return 0;
}
int cmmdc(int a,int b,int &x, int &y)
{
    if (b == 0)
    {
        x = 1;
        y = 0;
        return a;
    }
    int X,Y,D;
    D = cmmdc(b,a%b, X,Y);
    x = Y;
    y = X-a/b*Y;
    return D;
}