#include <fstream>
using namespace std;
int A, N;
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);
     }
}
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int main()
{
    long long inv = 0, ins;
    fin>>A>>N;
    gcd(inv,ins,A,N);
    if(inv<=0) inv=N+inv%N;
    fout<<inv;
}