#include <iostream>
#include <fstream>

using namespace std;

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

#define ll long long

int a, n;
ll inv, ins;

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

int main()
{
    fin >> a >> n;
    Inv(inv, ins, a, n);
    if(inv <= 0)
        inv = n + inv % n;
    fout << inv;
    return 0;
}