# Let's leave the calculator home, shall we?

Algebra Level 4

$\large\left\lfloor 78\tfrac12\times 79\tfrac12\times 80\tfrac12\times 81\tfrac12\right\rfloor$

Evaluate the above expression without a calculator.

Clarifications: $$\lfloor \cdot \rfloor$$ denotes the floor function.

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