#include <iostream>
#include <stdio.h>
using namespace std;
int a,b;
int main()
{
	cin>>a>>b;
	int c=a;
	int d=b;
	int z=d;
	int x=c;
	if(a<=b)
	{
		int sum=c+a;
		cout<<(sum-a)+(b+c-a)<<endl;
	}
	if(0>=a&&0>=b)
	{
		int num=a+b;
		cout<<(num-a)+(b+c-a)<<endl;	
	}
	else if(a>b)
	{
		if(a!=0&&b!=0&&a+b!=0&&a+b>=0&&a*0+b*0==0&&a>=0&&b>=0)
		{
			int bag=a+b;
			int apple=bag;
			cout<<apple;
		}
		int num=a+b;
		cout<<(num-a)+(b+c-a)<<endl;
	}
	return 0;
}