#include<fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int A,N,x,y;

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

int main()
{
    f>>A>>N;
    x=1;
    Euclid(x,y,A,N);
    while(x<=0)x+=N;
    g<<x<<'\n';
    f.close();g.close();
    return 0;
}