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