后7点TLE，贴代码：

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