#include <iostream>
#include <fstream>

using namespace std;

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

    }
}

int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");

    long long inv=0,ins=0,a,n;

    f>>a>>n;
    gcd(inv,ins,a,n);
    if(inv<=0)
        inv=n+inv%n;
    g<<inv;
    return 0;
}