#include <fstream>

using namespace std;

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

int n, a, b, c;
int x, y;

int Euclid_E(int a, int b, int &x, int &y);

int main()
{
 int aux;
 fin>>a>>n;
 Euclid_E(a, n, x, y);
 if (x < 0) {
    aux = (-1)*x;
    aux/=n;
    x+=(aux+1)*n;
 }
 fout<<x<<'\n';
 return 0;
}


int Euclid_E(int a, int b, int &x, int &y) {
    int x1, y1, d;
    if (b == 0) {
        x = 1; y = 0;
        return a;
    }
    d = Euclid_E(b, a%b, x1, y1);
    x = y1;
    y = x1-y1*(a/b);
    return d;
}