#include <iostream>
#include <fstream>

using namespace std;

void eucl(int a, int b, int &a2, int &b2)
{
    if (!b)
    {
        a2 = 1;
        b2 = 0;
        return;
    }
    eucl(b, a%b, a2, b2);
    int aux = a2;
    a2 = b2;
    b2 = aux - (a / b) * a2;
}

int main()
{
    ifstream fin("inversmodular.in");
    ofstream fout("inversmodular.out");
    int a, n, a2, b2;
    fin >> a >> n;
    eucl(a, n, a2, b2);
    if (a2 < 0)
        a2 += n;
    fout << a2;
    return 0;
}