#include <iostream>
#include <fstream>

using namespace std;

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

void euclid(int a, int b, int &x, int &y) {
    if(b == 0)
        x = y = 1;
    else {
        int x1, y1;
        euclid(b, a % b, x1, y1);
        x = y1;
        y = x1 - (a/b) * y1;
    }
}

int main() {
    int a, n; fin >> a >> n;
    int x, y;
    if(n > a)
        swap(a, n);
    euclid(a, n, x, y);
    fout << x;

}