#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a, b;
    cin >> a >> b;
    if (a == 0 || b == 0)
        cout << abs(a - b);
    else if (a > 0 && b > 0 || a < 0 && b < 0)
    {
        a = abs(a);
        b = abs(b);
        cout << max(a, b);
    }
    else
    {
        a = abs(a);
        b = abs(b);
        cout << a + b + a;
    }
    return 0;
}