#include <fstream>

using namespace std;

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

inline void Euclid(int a, int b, int &x, int &y)
{
    if(b == 0)
    {
        x = 1;
        y = 0;
    }
    else
    {
        int x0, y0;
        Euclid(b, a%b, x0, y0);

        x = y0;
        y = x0 - (a/b * y0);
    }
}

int inv_modular(int a, int mod)
{
    int b = mod;
    int x, y;
    Euclid(a, b, x, y);
    return x;
}

int main()
{
    int a, n;
    fin >> a >> n;
    fin.close();

    int x = inv_modular(a, n);
    while(x < 0) x += n;
    fout << x;
    fout.close();
    return 0;
}