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# [Jelly], 4 bytes

    X}€S

[Try it online!][TIO-kssbhrcf]

[Jelly]: https://github.com/DennisMitchell/jelly
[TIO-kssbhrcf]: https://tio.run/##y0rNyan8/z@i9lHTmuD///@b/jcDAA "Jelly – Try It Online"

## How it works

    X}€S - Main link. Takes n on the left, m on the right
      €  - Over each element of 1 through n:
     }   -   With m as its argument:
    X    -     Yield a random integer from 1 to m
       S - Sum