#include<fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int N, A, x ,y , d;
void euclid(int a, int b, int &d , int &x, int &y)
{
    if(b == 0)
    {
        d = a;
        x = 1;
        y = 0;
    }
    else
    {
        int x0, y0;
        euclid(b, a % b , d, x0, y0);
        x = y0;
        y = x0 - (a /b) *y0;
    }
}
void read()
{
    fin >>A >> N;
    euclid(A, N, d, x, y);
    while (x < 0 )
        x += N;
    fout <<x;
}
int main()
{
    read();
    //fout<<5;
    fin.close();
    return 0;
}