agc001-b-bruteforce

#include <iostream>
using namespace std;
using int64 = int64_t;

int f(int x, int y){
  int mx = max(x, y);
  int mn = min(x, y);
  if (mx == mn) return x;
  return f(mn, mx-mn) + 2 * mn;
}

int main(){
  int n, x;
  cin >> n >> x;
  int ans = x + (n-x) + f(x, n-x);
  cout << ans << endl;
  return 0;
}