#include <iostream>
#include <fstream>

using namespace std;

ifstream f("inversmodular.in");

ofstream g("inversmodular.out");

int euclidE(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    int x1,y1;
    int d=euclidE(b,a%b,x1,y1);
    x=y1;
    y=x1-(a/b)*y1;
    return d;
}

int main()
{
    int a,n,x,y;
    f>>a>>n;
    euclidE(a,n,x,y);
    while(x<0)x+=n;
    g<<x;
    return 0;
}