#include <fstream>

using namespace std;

void cmmdc (int a, int b, int& x, int& y)
{
    if (b == 0)
    {
        x = 1;
        y = 0;
        return;
    }

    int x0, y0;
    cmmdc(b, a%b, x0, y0);
    x = y0;
    y = x0 - (a/b) * y0;
}

int main()
{
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");

    int a, b, x, y;

    in>>a>>b;

    cmmdc(a, b, x, y);

    while(x<0)
        x+=b;

    out<<x;

    in.close();
    out.close();

    return 0;
}