{"problem":{"name":"Right Triangle","description":{"content":"There is a right triangle $ABC$ with $∠ABC=90°$. Given the lengths of the three sides, $|AB|,|BC|$ and $|CA|$, find the area of the right triangle $ABC$. It is guaranteed that the area of the triangle","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc116_a"},"statements":[{"statement_type":"Markdown","content":"There is a right triangle $ABC$ with $∠ABC=90°$.\nGiven the lengths of the three sides, $|AB|,|BC|$ and $|CA|$, find the area of the right triangle $ABC$.\nIt is guaranteed that the area of the triangle $ABC$ is an integer.\n\n## Constraints\n\n*   $1 \\leq |AB|,|BC|,|CA| \\leq 100$\n*   All values in input are integers.\n*   The area of the triangle $ABC$ is an integer.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$|AB|$ $|BC|$ $|CA|$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc116_a","tags":[],"sample_group":[["3 4 5","6\n\n![image](https://img.atcoder.jp/ghi/44c1d4cbdf4677ce3b08ca70b5ce98ea.png)\nThis triangle has an area of $6$."],["5 12 13","30\n\nThis triangle has an area of $30$."],["45 28 53","630\n\nThis triangle has an area of $630$."]],"created_at":"2026-03-03 11:01:14"}}