{"raw_statement":[{"iden":"problem statement","content":"In an electric circuit, when two resistors $R_1$ and $R_2$ are connected in parallel, the equivalent resistance $R_3$ can be derived from the following formula:\n\n*   $\\frac{1}{R_1} + \\frac{1}{R_2} = \\frac{1}{R_3}$\n\nGiven $R_1$ and $R_2$, find $R_3$."},{"iden":"constraints","content":"*   $1 \\leq R_1, R_2 \\leq 100$\n*   $R_1$ and $R_2$ are integers."},{"iden":"input","content":"The input is given from Standard Input in the following format:\n\n$R_1$ $R_2$"},{"iden":"sample input 1","content":"2 3"},{"iden":"sample output 1","content":"1.2000000000"},{"iden":"sample input 2","content":"100 99"},{"iden":"sample output 2","content":"49.7487437186"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}