#include <bits/stdc++.h>
using namespace std;
int gcd(int a, int b) {
  if (a % b == 0)
    return b;
  else
    return gcd(b, a % b);
}
int main() {
  long long int a, b;
  cin >> a >> b;
  cout << 3 * (a - gcd(a, b)) << endl;
}
