{"problem":{"name":"Arithmetic Sequence","description":{"content":"Given is a sequence of three integers $A = (A_1, A_2, A_3)$. On this sequence, you can do the following operation any number of times: *   choose $i\\in {1,2,3}$ and add $1$ to $A_i$. Find the minimu","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"arc123_a"},"statements":[{"statement_type":"Markdown","content":"Given is a sequence of three integers $A = (A_1, A_2, A_3)$. On this sequence, you can do the following operation any number of times:\n\n*   choose $i\\in {1,2,3}$ and add $1$ to $A_i$.\n\nFind the minimum number of operations needed to make $A$ arithmetic. Here, the sequence $A = (A_1, A_2, A_3)$ is arithmetic when $A_2 - A_1 = A_3 - A_2$ holds.\n\n## Constraints\n\n*   $1\\leq A_1, A_2, A_3\\leq 10^{15}$\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$A_1$ $A_2$ $A_3$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"arc123_a","tags":[],"sample_group":[["4 8 10","2\n\nOne operation with $i = 1$ and then one operation with $i = 3$ yield an arithmetic sequence $(5, 8, 11)$."],["10 3 4","4\n\nFour operations with $i = 2$ yield an arithmetic sequence $(10, 7, 4)$."],["1 2 3","0\n\nThe sequence $A$ is already arithmetic from the beginning, so we need zero operations."],["1000000000000000 1 1000000000000000","999999999999999"]],"created_at":"2026-03-03 11:01:14"}}