#include <fstream>
using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

int n,a;

void 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()
{
    f>>a>>n;

    int x,y;
    euclid(a,n,x,y);

    if (x<0)
    {
        x = n + x%n;
    }

    g<<x;
    return 0;
}