#include <fstream>
using namespace std;

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

int a, n;
long long inv, ins;

void gcd(int a, int b, long long& x, long long& y)
{
    if(!b)
        x=1, y=0;
    else
    {
        gcd(b, a%b, x, y);

        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}

int main()
{
    fin>>a>>n;

    gcd(a, n, inv, ins);
    if(inv<=0)
        inv=n+inv%n;
    fout<<inv;

    return 0;
}