#include <fstream>

using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a, n;

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

int main()
{
    f>>a>>n;
    int d, x, y;
    gcd(a, n, &d, &x, &y);

    if(x <= 0)
    {
        x = n + x%n;
    }

    g<<x;
    return 0;
}