#include <bits/stdc++.h>
using namespace std;
const long long INF = 1LL << 60;
struct Edge {
  long long to, cap, rev;
  Edge(long long _to, long long _cap, long long _rev) {
    to = _to;
    cap = _cap;
    rev = _rev;
  }
};
void add_edge(vector<vector<Edge> > &G, long long from, long long to,
              long long cap) {
  G[from].push_back(Edge(to, cap, (long long)G[to].size()));
  G[to].push_back(Edge(from, 0, (long long)G[from].size() - 1));
}
long long max_flow_dfs(vector<vector<Edge> > &G, long long v, long long t,
                       long long f, vector<bool> &used) {
  if (v == t) return f;
  used[v] = true;
  for (int i = 0; i < G[v].size(); ++i) {
    Edge &e = G[v][i];
    if (!used[e.to] && e.cap > 0) {
      long long d = max_flow_dfs(G, e.to, t, min(f, e.cap), used);
      if (d > 0) {
        e.cap -= d;
        G[e.to][e.rev].cap += d;
        return d;
      }
    }
  }
  return 0;
}
long long max_flow(vector<vector<Edge> > &G, long long s, long long t) {
  long long flow = 0;
  for (;;) {
    vector<bool> used(G.size());
    for (int(i) = 0; (i) < (used.size()); (i)++) used[i] = false;
    long long f = max_flow_dfs(G, s, t, INF, used);
    if (f == 0) {
      return flow;
    }
    flow += f;
  }
}
template <class T>
inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
class UnionFind {
  vector<int> data;

 public:
  UnionFind(int size) : data(size, -1) {}
  bool unionSet(int x, int y) {
    x = root(x);
    y = root(y);
    if (x != y) {
      if (data[y] < data[x]) swap(x, y);
      data[x] += data[y];
      data[y] = x;
    }
    return x != y;
  }
  bool findSet(int x, int y) { return root(x) == root(y); }
  int root(int x) { return data[x] < 0 ? x : data[x] = root(data[x]); }
  int size(int x) { return -data[root(x)]; }
};
void divisor(long long n, vector<long long> &ret) {
  for (long long i = 1; i * i <= n; i++) {
    if (n % i == 0) {
      ret.push_back(i);
      if (i * i != n) ret.push_back(n / i);
    }
  }
  sort(ret.begin(), ret.end());
}
long long factorial(long long n, long long mod) {
  long long ret = 1;
  for (long long i = 1; i <= n; i++) {
    ret = (ret * i) % mod;
  }
  return ret;
}
long long inv_mod(long long n, long long mod) {
  long long a = n % mod, b = mod - 2, ret = 1;
  while (b > 0) {
    if (b & 1) ret = (ret * a) % mod;
    a = (a * a) % mod;
    b >>= 1;
  }
  return ret;
}
long long nPr(long long n, long long r, long long mod) {
  long long ret = 1;
  for (long long i = n; i >= n - r + 1; i--) {
    ret = ret * (i % mod) % mod;
  }
  return ret;
}
long long nCr(long long n, long long r, long long mod) {
  return nPr(n, r, mod) * inv_mod(factorial(r, mod), mod) % mod;
}
bool compare_by_b(pair<long long, long long> a, pair<long long, long long> b) {
  if (a.second != b.second) {
    return a.second > b.second;
  } else {
    return a.first > b.first;
  }
}
bool compare_by_a(pair<long long, long long> a, pair<long long, long long> b) {
  if (a.first != b.first) {
    return a.first > b.first;
  } else {
    return a.second > b.second;
  }
}
long long gcd(long long m, long long n) {
  if (n == 0) return m;
  return gcd(n, m % n);
}
int main() {
  long long n, x;
  cin >> n >> x;
  long long side = n - x;
  long long ans = x;
  while (1) {
    if (x % side == 0) break;
    n = n % side;
    x = x % side;
    side = side - n;
    ans += n;
  }
  cout << ans * 3;
  return 0;
}
