#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int N, X;
  cin >> N >> X;
  int ans = N;
  int a = max(N - X, X);
  int b = min(N - X, X);
  int q;
  while (b) {
    q = a % b;
    ans += (a - q) * 2;
    a = b;
    b = q;
  }
  ans -= a;
  cout << ans << endl;
  return 0;
}
