{"raw_statement":[{"iden":"problem statement","content":"Print the circumference of a circle of radius $R$."},{"iden":"constraints","content":"*   $1 \\leq R \\leq 100$\n*   All values in input are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$R$"},{"iden":"sample input 1","content":"1"},{"iden":"sample output 1","content":"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."},{"iden":"sample input 2","content":"73"},{"iden":"sample output 2","content":"458.67252742410977361942"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}