#include <iostream>
#include <fstream>
using namespace std;

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

int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    int a, n;
    f >> a >> n;
    int x, y;
    euclid(a, n, x, y);
    while(x<0)
        x+=n;
    g<<x;
}