#include <fstream>
using namespace std;
FILE * fin = fopen("inversmodular.in", "r");
FILE * fout = fopen("inversmodular.out", "w");

void euclide(int a, int b, int& d, int&x, int& y);

int main()
{
    int a, n, d, x, y;
    fscanf(fin, "%d %d", &a, &n);
    
    euclide(a, n, d, x, y);
    while (x<0) x=x+n;
    fprintf(fout, "%d\n", x);
    
    fclose(fin);
    fclose(fout);
    return 0;
}

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