#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void gcd(long long &x , long long &y , int a , int b)
{
    if(!b)
    {
        x=1;
        y=0;
    }
    else
    {
        gcd(x, y, b, a%b);
        long long aux;
        aux = x;
        x = y;
        y=aux - y * (a / b);
    }
}

int main()
{
    long long x = 0 , y , a , n ;
    fin >> a >> n;
    gcd(x,y,a,n);
    if(x <= 0)
        x = n + x % n;
    fout<<x;
    return 0;
}