#include <fstream>
using namespace std;
ifstream  fin("inversmodular.in");
ofstream fout("inversmodular.out");
int A,N;
long long inv,ins;
void euclid(long long &x, long long &y, int a,int b)
{
    if(!b)
    {
        x=1;
        y=0;
    }
    else
    {
       euclid(x,y,b,a%b);
       long long aux=x;
       x=y;
       y=aux-y*(a/b);
    }
}

int main()
{
    fin>>A>>N;

    euclid(inv,ins,A,N);

    if(inv<=0)
    {
        inv=N+inv%N;
    }

    fout<< inv;

    return 0;
}