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