#include<bits/stdc++.h>
using namespace std;
int a, b;
int main(){
    cin >> a >> b;
    if(a == b){
        cout << abs(a) << endl;
    }
    else{
        if(a >= 0 && b >= 0){
            cout << max(a, b) << endl;
        }
        else{
            cout << min(abs(a), abs(b)) * 2 + max(abs(a), abs(b));
        }
    }
    return 0;
}

WA on #7