#include <bits/stdc++.h>

using namespace std;

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

int A,n;

void euclid(int a, int b, int &x, int &y)
{
    if (b == 0) {

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

int main()
{
    fin>>A>>n;
    int x,y;
    euclid(A,n,x,y);
    if(x<=0)
    {
        x=n+x%n;
    }
    fout<<x;
    return 0;
}