#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int a, n, x, y;


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()
{
    fin >> a >> n;
    euclid(a, n , x ,y);
    while(x < 0)
        x += n;
    fout << x;
    return 0;
}