#include <fstream>

using namespace std;

void euclid(int a, int b, int &d, int &x, int &y)
{
    if(b == 0)
    {
        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()
{
    ifstream fin("inversmodular.in");
    ofstream fout("inversmodular.out");

    int n, a, x, y, d;

    fin >> a >> n;

    euclid(a, n, d, x, y);

    while(x < 0)
    {
        x += n;
    }

    fout << x;

    return 0;
}