#include <iostream>
#include <bits/stdc++.h>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void gcd(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return;
    }
    int x0, y0;
    gcd(b, a%b, x0, y0);
    x=y0;
    y=x0-y0*(a/b);
}
int main()
{
    int A, N, X, Y;
    f>>A>>N;
    gcd(A, N, X, Y);
    while(X<=0)X+=N;
    g<<X;
    return 0;
}