#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int x,n;
void gcd(int &a,int &b,int x,int y)
{
    if(y==0)
    {
        a=1;
        b=0;
        return;
    }
    int x1,y1;
    gcd(x1,y1,y,x%y);
    a=y1;
    b=x1-y1*(x/y);
}
int main()
{
    f>>x>>n;
    int a,b;
    gcd(a,b,x,n);
    while(a<=0)
        a=a%n+n;
    g<<a;
    return 0;
}