#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 = x;
         x = y;
         y = aux - y * (a / b);
     }
}

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