var __Ox63f49=["\x76\x61\x6C\x75\x65","\x64\x69\x62\x69\x61\x6E","\x67\x65\x74\x45\x6C\x65\x6D\x65\x6E\x74\x42\x79\x49\x64","\x67\x61\x6F\x64\x75","\u8BF7\u8F93\u5165\u6570\u5B57","\x6D\x69\x61\x6E\x6A\x69","\x74\x6F\x46\x69\x78\x65\x64"];function calc(){var _0x7d1fx2=document[__Ox63f49[0x2]](__Ox63f49[0x1])[__Ox63f49[0x0]];var _0x7d1fx3=document[__Ox63f49[0x2]](__Ox63f49[0x3])[__Ox63f49[0x0]];if(!is_float(_0x7d1fx2)||  !is_float(_0x7d1fx3)){showerror(__Ox63f49[0x4]);return false}else {document[__Ox63f49[0x2]](__Ox63f49[0x5])[__Ox63f49[0x0]]= ((_0x7d1fx2* _0x7d1fx3)/ 2)[__Ox63f49[0x6]](4)}}
function is_float(_0xac82x15){var _0xac82x20=/^(-?\d+)(\.\d+)?$/;if(!_0xac82x20['test'](_0xac82x15)){return false};return true}
function showerror(){
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}