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