#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,x,xnou,ynou,y;
void euclidex(int a,int b,int &x,int &y)
{
    if (b==0)
    {
        x=1;
        y=1;
    }
    else
    {
        int xnou,ynou;
        euclidex(b,a%b,xnou,ynou);
        x=ynou;
        y=xnou-a/b*ynou;
    }
}
int main()
{
    f>>a>>n;
    euclidex(a,n,x,y);
    //cout<<x<<" "<<y<<endl;
    while(x<0)
    {
        x+=n;
    }
    g<<x;
    return 0;
}