#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,cop,x0,x1,r,c,x;
int main()
{
    f>>a>>n;
    cop=n;x0=1;x1=0;
    while(n!=0)
    {
        r=a%n;
        c=a/n;
        a=n;
        n=r;
        x=x0-c*x1;
        x0=x1;
        x1=x;
    }
    if(x0<0) x0+=cop;
    g<<x0<<'\n';
    return 0;
}