//Invers Modular
#include <fstream>
using namespace std;


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

    }
}
int main()
{
    ifstream  f("inversmodular.in");
    ofstream g("inversmodular.out");
    int a,n,d,x,y;
    f>>a>>n;
    EuclidExtended(a,n,d,x,y);
    while(x < 0 )
    {
        x+=n;
    }
    g<<x % n ;
    return 0;
}