#include<fstream>
#include<algorithm>
#include<vector>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,x,y,d;
void euclid_extins(int a,int b,int &d,int &x,int &y)
{
    if(b==0)
    {
        d=a;
        x=1;
        y=0;
    }
    else
    {
        int x0,y0;
        euclid_extins(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int main()
{
    f>>a>>n;
    euclid_extins(a,n,d,x,y);
    if(x<=0)
      x=n+x%n;
    g<<x;
    return 0;
}