#include <bits/stdc++.h>
using namespace std;
void debug_out() { cerr << endl; }
template <class T>
ostream& prnt(ostream& out, T v) {
  out << v.size() << '\n';
  for (auto e : v) out << e << ' ';
  return out;
}
template <class T>
ostream& operator<<(ostream& out, vector<T> v) {
  return prnt(out, v);
}
template <class T>
ostream& operator<<(ostream& out, set<T> v) {
  return prnt(out, v);
}
template <class T1, class T2>
ostream& operator<<(ostream& out, map<T1, T2> v) {
  return prnt(out, v);
}
template <class T1, class T2>
ostream& operator<<(ostream& out, pair<T1, T2> p) {
  return out << '(' << p.first << ' ' << p.second << ')';
}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << H;
  debug_out(T...);
}
long long n, x, ans;
int main() {
  ios_base::sync_with_stdio(false);
  cin >> n >> x;
  ans += n;
  long long a = x;
  long long b = n - x;
  if (a < b) swap(a, b);
  long long c = a % b;
  while (c) {
    if (a < b) swap(a, b);
    c = a % b;
    ans += 2 * (a / b) * b;
    cerr << "a, b, ans"
         << " ->",
        debug_out(a, b, ans);
    if (c == 0) ans -= b;
    a = b;
    b = c;
  }
  ans += b;
  cout << ans << '\n';
}
