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