#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll x,y,ans;
ll b(ll xx,ll yy){
	ll minn=min(xx,yy),maxx=max(xx,yy);
	if(xx==yy) return ans+xx*4;
	ans+=minn*4;
	b(minn,maxx-minn); 
}
int main(){
	cin>>x>>y;
	cout<<b(min(x,y),max(x,y));
	return 0;
}