#include <fstream>
using namespace std;

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

void euclid_ext(int a, int b, int &gcd, int &x, int &y)
{
    if (b == 0)
    {
        x = 1;
        y = 0;
        gcd = a;
        return;
    }
    int px, py;
    euclid_ext(b, a % b, gcd, px, py);
    x = py;
    y = px - (a / b) * py;
}

int main()
{
    int a, b, x, y, gcd;
    fin >> a >> b;
    euclid_ext(a, b, gcd, x, y);
    int temp = 1 / gcd * x;
    if (temp < 0)
    {
        int cnt = temp / b;
        temp += (cnt + 1) * b;
    }
    fout << temp;
    return 0;
}