#include <fstream>

using namespace std;

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

int main()
{
    long long int a,x,y,d,n;
    d = 1;
    ifstream f("inversmodular.in");
    f >> a >> n;
    f.close();
    euclidext(a,n,x,y,d);
    if(a <= 0)
        x = n + x % n;
    ofstream g("inversmodular.out");
    g << x;
    g.close();
    return 0;
}