#include<iostream>
#include<fstream>
#define LL long long
using namespace std;

#define ll long long

int A, N;

void gcd(ll &x, ll &y, int a, int b)
{
     if (!b)
         x = 1, y = 0;
     else
     {
         gcd(x, y, b, a % b);
         ll aux = x;
         x = y;
         y = aux - y * (a / b);
     }
}

int main()
{
    ll inv = 0, ins;

    fstream f("inversmodular.in",ios::in);
    fstream g("inversmodular.out",ios::out);
    f>>A>>N;
    gcd(inv, ins, A, N);

    if (inv <= 0)
       inv = N + inv % N;

    g<<inv;

    return 0;
}