{"raw_statement":[{"iden":"problem statement","content":"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:\n![image](https://atcoder.jp/img/abc056/5c3a0ed9a07aa0992011c11ffbc9441b.png)\nAtCoDeer will move the second rectangle horizontally so that it connects with the first rectangle. Find the minimum distance it needs to be moved."},{"iden":"constraints","content":"*   All input values are integers.\n*   $1≤W≤10^5$\n*   $1≤a,b≤10^5$"},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$W$ $a$ $b$"},{"iden":"sample input 1","content":"3 2 6"},{"iden":"sample output 1","content":"1\n\nThis input corresponds to the figure in the statement. In this case, the second rectangle should be moved to the left by a distance of $1$."},{"iden":"sample input 2","content":"3 1 3"},{"iden":"sample output 2","content":"0\n\nThe rectangles are already connected, and thus no move is needed."},{"iden":"sample input 3","content":"5 10 1"},{"iden":"sample output 3","content":"4"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}