#include <fstream>
typedef long long ll;

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

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

int main()
{
    int a, n;
    ll inv=0, y=0;
    fin >> a >> n;
    gcd(inv, y, a, n);
    if(inv<=0)
        inv=n+inv%n;
    fout << inv;
    return 0;
}