Rover 承担了火星土壤采样分析任务，你需要写一个分析模块，来根据探测器检测到的分子式计算物质的分子质量。
元素由一个大写字母或一个大写字母加一个小写字母组成，如H(氢)，C(碳)，He(氦)，Cu(铜)。分子式由元素名，数字，括号()[]{}组成，如H2O，CH3(CH2)16CH3，Fe3[Fe(CN)6]2。
输入每个元素的相对原子质量和要求的分子式，输出相对分子质量
H = 1.00794
C = 12.011
N = 14.00674
O = 15.9994
Fe = 55.845
H2O
CH3(CH2)16CH3
Fe3[Fe(CN)6]2
H2O = 18.015
CH3(CH2)16CH3 = 254.5
Fe3[Fe(CN)6]2 = 591.438
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