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