#include <fstream>

using namespace std;

ifstream cin ("inversmodular.in");
ofstream cout ("inversmodular.out");

void gcd(long long &x, long long &y, int a, int b)
{
    if (!b)
        x = 1, y = 0;
    else
    {
        gcd(x, y, b, a % b);
        long long aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}
int main()
{
    long long x = 0, y;
    int a,n;
    cin>>a>>n;
    gcd(x, y, a, n);
    if (x <= 0)
    {
        x = n + x % n;
    }
    cout<<x;
    return 0;
}