{"problem":{"name":"Dodecagon","description":{"content":"It is known that the area of a regular dodecagon inscribed in a circle of radius $a$ is $3a^2$. Given an integer $r$, find the area of a regular dodecagon inscribed in a circle of radius $r$.","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc134_a"},"statements":[{"statement_type":"Markdown","content":"It is known that the area of a regular dodecagon inscribed in a circle of radius $a$ is $3a^2$.\nGiven an integer $r$, find the area of a regular dodecagon inscribed in a circle of radius $r$.\n\n## Constraints\n\n*   $1 \\leq r \\leq 100$\n*   $r$ is an integer.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$r$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc134_a","tags":[],"sample_group":[["4","48\n\nThe area of the regular dodecagon is $3 \\times 4^2 = 48$."],["15","675"],["80","19200"]],"created_at":"2026-03-03 11:01:14"}}