#include <iostream>
#include <fstream>
using namespace std;
ifstream in("functii.in");
ofstream out("functii.out");
void euclid(int a, int b, int& x, int& y)
{
    if (b == 0)
    {
        x = 1, y = 1;
    }
    else
    {
        int x1, y1;
        euclid(b, a % b, x1, y1);
        x = y1;
        y = x1 - a / b * y1;
    }
}
int invmod(int a,int n)
{
    int x, y;
    euclid(a, n, x, y);
    while (x < 0)
        x += n;
    return x;
}
int main()
{
    int n, a;
    cin >> a >> n;
    cout << invmod(a, n);
    return 0;
}