#include <iostream>
#include <fstream>

using namespace std;

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

int A,N;

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

int main()
{
    long long inv=0,ins;
    fin>> A >> N;
    euclidext(inv,ins,A,N);
    if(inv<=0) inv+=N+inv%N;
    fout << inv;
    return 0;
}