#include <fstream>

using namespace std;

ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");

void Euclid(const int A, const int B, int &X, int &Y)
{
    if (B == 0)
    {
        X = 1;
        Y = 0;
        return;
    }
    int X0, Y0;
    Euclid(B, A % B, X0, Y0);

    X = Y0;
    Y = X0 - (A / B) * Y0;
}

int InvMod(const int A, const int N)
{
    int x, y;
    Euclid(A, N, x, y);

    if (x < 0)
        x = N + x % N;
    return x;
}

int main()
{
    int A, N;
    cin >> A >> N;

    cout << InvMod(A, N);

    cin.close();
    cout.close();
}