// inversmodular
#include <iostream>
#include <fstream>

using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

int a, n;

void gcd(int a, int b, int *x, int *y) {

	if (b == 0) {
		*x = 1;
		*y = 0;
	} else {
		int x0, y0;
		gcd(b, a%b, &x0, &y0);
		*x = y0;
		*y = x0 - (a/b)*y0;
	}
}

void read() {

	f>>a>>n;
	int xs, ys; // xs = inversul modular
	gcd(a, n, &xs, &ys);
	if (xs <= 0) {
		xs = n + xs%n;
	}

	g<<xs<<'\n';
}

int main() {

	read();

	f.close(); g.close();
	return 0;
}