#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int n,p;
void euclid(int a,int b,int &x,int& y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return;
    }
    else
    {
        int x0,y0;
        euclid(b,a%b,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int main()
{
    f>>n>>p;
    f.close();
    int x,y;
    euclid(n,p,x,y);
   while(x<=0)
    x+=p;
   g<<x;
   g.close();
}