#include <fstream>

using namespace std;
using ll = long long;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void gcd(ll &x, ll &y, ll a, ll 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()
{
    int a, n;
    ll inv = 0, ins;
    fin >> a >> n;
    gcd(inv, ins, a, n);
    if (inv <= 0)
        inv = n + inv % n;
    fout << inv << '\n';
    return 0;
}