#include <iostream>
#include <fstream>
using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

int inverse_modulare(long long &x,long long &y,int A,int N)
{
    if(0==N)
    {
        x=1;
        y=0;
    }
    else
    {
        inverse_modulare(x,y,N,A%N);
        int aux=x;
        x=y;
        y=aux-y*(A/N);
    }

}

int main()
{
    long long inv=0,y=0;
    int a,n;
    f >> a >>n;
    inverse_modulare(inv,y,a,n);
    if(inv<0)
        inv+=n;
    g << inv;
    return 0;
}