#include <fstream>

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