#include <iostream>
#include <vector>
#include <unordered_map>
#include <algorithm>
#include <vector>

using namespace std;
int main()
{
    int x, y, answer(0),natural(0),unnatural(0);

    cin >> x >> y;

        int temp_2,temp_3;
        if(x < y){
            temp_2= x*2;
        }
        else if(y < x){
            temp_2 = y*2;
        }

        temp_3 = abs(x-y);

        answer = abs(temp_2 - temp_3);
    
        if(x == y){
            answer = 0;
        }

    cout<<answer;

    return 0;
}