#include <bits/stdc++.h>
using namespace std;
long long x,y;
int main(){
cin >> x >> y;
long long sum = 0;
while(x&&y) {
    sum+=min(x,y)*4;
    if(min(x,y)==x) {
    y -= min(x,y);
    } 
	else{
        x -= min(x,y);
    }
}
cout << sum << endl;
	return 0;
}