#include<math.h>
#include<algorithm>
#include<cstring>
#include<stdio.h>
#include<iostream>
#include<stack>
#include<queue>
#include<cstring>
using namespace std;
int main(){
	int x,y,dis=0;
	cin>>x>>y;
	while(x&&y){
		dis+=min(x,y)*4;
		if(x>y){
			x-=y;
			continue;
		}
		y-=x;
	}
	printf("%d",dis);
	return 0;
}