#include <fstream>

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

int A, N;

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

int main()
{
    long long g=0, h;

    fin>>A>>N;
    im(g,h,A,N);

    while(g<=0)
        g=N+g;


    fout<<g;

    return 0;
}