{"problem":{"name":"Circle Pond","description":{"content":"Print the circumference of 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":"abc163_a"},"statements":[{"statement_type":"Markdown","content":"Print the circumference of a circle of radius $R$.\n\n## Constraints\n\n*   $1 \\leq R \\leq 100$\n*   All values in input are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$R$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc163_a","tags":[],"sample_group":[["1","6.28318530717958623200\n\nSince we accept an absolute or relative error of at most $10^{-2}$, $6.28$ is also an acceptable output, but $6$ is not."],["73","458.67252742410977361942"]],"created_at":"2026-03-03 11:01:13"}}