#include <bits/stdc++.h>
#define st first
#define nd second

using namespace std;

void debug_out() { cerr << endl; }
template<class T> ostream& prnt(ostream& out, T v) { out << v.size() << '\n'; for(auto e : v) out << e << ' '; return out;}
template<class T> ostream& operator<<(ostream& out, vector <T> v) { return prnt(out, v); }
template<class T> ostream& operator<<(ostream& out, set <T> v) { return prnt(out, v); }
template<class T1, class T2> ostream& operator<<(ostream& out, map <T1, T2> v) { return prnt(out, v); }
template<class T1, class T2> ostream& operator<<(ostream& out, pair<T1, T2> p) { return out << '(' << p.st << ' ' << p.nd << ')'; }
template <typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << " " << H; debug_out(T...);}

#define dbg(...) cerr << #__VA_ARGS__ << " ->", debug_out(__VA_ARGS__)
#define dbg_v(x, n) do{cerr<<#x"[]: ";for(long long _=0;_<n;++_)cerr<<x[_]<<" ";cerr<<'\n';}while(0)
#define dbg_ok cerr<<"OK!\n"

// const long long N = ;
long long n, x, ans;

int main() {
	ios_base::sync_with_stdio(false);
	cin >> n >> x;

	ans += n;

	long long a = x;
	long long b = n - x;
	if(a < b) swap(a, b);

	while(b) {
		// if(a < b) swap(a, b);
		long long c = a % b;
		ans += 2 * (a / b) * b;
		dbg(a, b, ans);
		if(c == 0) ans -= bz;
		a = b;
		b = c;
	}
	// ans += b;
	cout << ans << '\n';

}	

	