{"problem":{"name":"Intersection","description":{"content":"We have a number line. Takahashi painted some parts of this line, as follows: *   First, he painted the part from $X=L_1$ to $X=R_1$ red. *   Next, he painted the part from $X=L_2$ to $X=R_2$ blue. ","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc261_a"},"statements":[{"statement_type":"Markdown","content":"We have a number line. Takahashi painted some parts of this line, as follows:\n\n*   First, he painted the part from $X=L_1$ to $X=R_1$ red.\n*   Next, he painted the part from $X=L_2$ to $X=R_2$ blue.\n\nFind the length of the part of the line painted both red and blue.\n\n## Constraints\n\n*   $0\\leq L_1<R_1\\leq 100$\n*   $0\\leq L_2<R_2\\leq 100$\n*   All values in input are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$L_1$ $R_1$ $L_2$ $R_2$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc261_a","tags":[],"sample_group":[["0 3 1 5","2\n\nThe part from $X=0$ to $X=3$ is painted red, and the part from $X=1$ to $X=5$ is painted blue.\nThus, the part from $X=1$ to $X=3$ is painted both red and blue, and its length is $2$."],["0 1 4 5","0\n\nNo part is painted both red and blue."],["0 3 3 7","0\n\nIf the part painted red and the part painted blue are adjacent to each other, the length of the part painted both red and blue is $0$."]],"created_at":"2026-03-03 11:01:14"}}