#include <bits/stdc++.h>

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

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

int euclid(int a,int b,int &x, int &y){
    if(b == 0){
        x = 1;
        y = 0;
        return a;
    }
    int x0,y0;
    d = euclid(b, a % b, x0, y0);
    x = y0;
    y = x0 - (a / b) * y0;
    return d;
}
int main()
{
    f >> a >> n;
    d = euclid(a,n,x,y);
    if(x < 0)
        x = n + x % n;
    g << x;
    return 0;
}