#include <fstream>
using namespace std;

ifstream is("inversmodular.in");
ofstream os("inversmodular.out");

void EDC(int a, int b, int &x, int &y);
int a, b;
int x, y;

int main()
{
    is >> a >> b;
    EDC( a, b, x, y );
    if ( x <= 0 )
        x += b;
    os << x;

    is.close();
    os.close();
    return 0;
}

void EDC(int a, int b, int &x, int &y)
{
    if(b == 0)
    {
        x = 1;
        y = 0;
        return;
    }
    int x0, y0;
    EDC(b, a % b, x0, y0);
    x = y0;
    y = x0 - (a / b) * y0;
}