{"raw_statement":[{"iden":"problem statement","content":"Given is a sequence of $N$ integers $A_1, \\ldots, A_N$.\nFind the (multiplicative) inverse of the sum of the inverses of these numbers, $\\frac{1}{\\frac{1}{A_1} + \\ldots + \\frac{1}{A_N}}$."},{"iden":"constraints","content":"*   $1 \\leq N \\leq 100$\n*   $1 \\leq A_i \\leq 1000$"},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$\n$A_1$ $A_2$ $\\ldots$ $A_N$"},{"iden":"sample input 1","content":"2\n10 30"},{"iden":"sample output 1","content":"7.5\n\n$\\frac{1}{\\frac{1}{10} + \\frac{1}{30}} = \\frac{1}{\\frac{4}{30}} = \\frac{30}{4} = 7.5$.\nPrinting `7.50001`, `7.49999`, and so on will also be accepted."},{"iden":"sample input 2","content":"3\n200 200 200"},{"iden":"sample output 2","content":"66.66666666666667\n\n$\\frac{1}{\\frac{1}{200} + \\frac{1}{200} + \\frac{1}{200}} = \\frac{1}{\\frac{3}{200}} = \\frac{200}{3} = 66.6666...$.\nPrinting `6.66666e+1` and so on will also be accepted."},{"iden":"sample input 3","content":"1\n1000"},{"iden":"sample output 3","content":"1000\n\n$\\frac{1}{\\frac{1}{1000}} = 1000$.\nPrinting `+1000.0` and so on will also be accepted."}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}