Problem:
Score : 200 points

Problem Statement

AtCoDeer the deer found two rectangles lying on the table, each with height 1 and width W.
If we consider the surface of the desk as a two-dimensional plane, the first rectangle covers the vertical range of [0,1] and the horizontal range of [a,a+W], and the second rectangle covers the vertical range of [1,2] and the horizontal range of [b,b+W], as shown in the following figure:

AtCoDeer will move the second rectangle horizontally so that it connects with the first rectangle.
Find the minimum distance it needs to be moved.

Constraints

All input values are integers.

1≤W≤10^5

1≤a,b≤10^5

Input

The input is given from Standard Input in the following format:

W a b

Output

Print the minimum distance the second rectangle needs to be moved.

Sample Input 1

3 2 6

Sample Output 1

1

This input corresponds to the figure in the statement. In this case, the second rectangle should be moved to the left by a distance of 1.

Sample Input 2

3 1 3

Sample Output 2

0

The rectangles are already connected, and thus no move is needed.

Sample Input 3

5 10 1

Sample Output 3

4

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>

using namespace std;
 
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define endl '\n'
typedef long long ll;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int W, a, b;
    cin >> W >> a >> b;
    if(a < b){
        int hoge = W+a;
        if(hoge >= b)cout<<0<<endl;
        else cout<<b-hoge<<endl;
    }else{
        int hoge = W+b;
        if(hoge >= a)cout<<0<<endl;
        else cout<<a-hoge<<endl;
    }
}