#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int a, n, d, x, y;

void euclid(int a, int b, int &d, int &x, int &y)
{
    if(!b)
    {
        d=a;
        x=1;
        y=0;
    }
    else
    {
        int x0, y0;
        euclid(b, a%b, d, x0, y0);
        x=y0;
        y=x0-a/b*y0;
    }
}

int main()
{
    fin>>a>>n;
    euclid(a,n,d,x,y);
    x=x%n;
    fout<<x;
    return 0;
}