#include <fstream>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int A, N;
long long w, k;
void rid(long long &x, long long &y, int a, int b)
{
    if (!b)
    {
        x=1;
        y=0;
    }
    else
    {
        rid(x, y, b, a%b);
        int aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    fin>>A>>N;
    w=0; k=0;
    rid(w, k, A, N);
    if (w<=0)
    {
        w=N+w%N;
    }
    fout<<w;
    return 0;
}