#include <iostream>
#include <fstream>

using namespace std;

int  A,N;
void euclide(int a,int  b,int &x,int &y)
{
    if(b==0)
    {
        x=1,y=0;
        return;
    }
    int x0,y0;
    euclide(b,a%b,x0,y0);
    x=y0;
    y=x0-(a/b)*y0;
    return;
}
int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
        f>>A>>N;
        int x,y;
        euclide(A,N,x,y);
        while(x<0)x+=N;
        g<<x;
    return 0;
}