#include <fstream>

using namespace std;

ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");

int a, b;

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 main()
{
    cin >> a >> b;
    int x = 0, y;
    euclid(a, b, x, y);
    while (x <= 0)
        x += b;
    cout << x;
    return 0;
}