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

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

void inv_mod(long long &x, long long &y, int a, int b)
{
    if(b==0)
    {
        x=1, y=0;
        return;
    }
    inv_mod(x, y, b, a%b);
    long long aux=x;
    x=y, y=aux-y*(a/b);
}

int main()
{
    ios_base::sync_with_stdio(false);
    int a, n;
    long long inv=0, ins;
    fin >> a >> n;
    inv_mod(inv, ins, a, n);
    if (inv<=0) inv=n+inv%n;
    fout << inv;
    fin.close();
    fout.close();
    return 0;
}