#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() {
  int N, K;
  cin >> N >> K;
  cout << ((N / gcd(N, K)) * 3 - 3) * gcd(N, K) << endl;
}
