Let X be the set consisting of the first 2018 terms of the arithmetic progression $1,6,11, \ldots$., and Y be the set consisting of the first 2018 terms of arithmetic progression 9, 16, 23, $\ldots .$. . Then, the number of elements in the set $\mathrm{X} \cup \mathrm{Y}$ is $\_\_\_\_$ .
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