#include <fstream>
#define ll long long
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("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()
{
    fin>>a>>n;
    ll inv = 0,ins;
    gcd(inv, ins, a, n);
    if(inv <= 0)
        inv = n + inv % n;
    fout<<inv;

    return 0;
}